Make Ahead Veggie Breakfast Casserole Recipe | Little Spice Jar (2024)

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A super simple veggie loaded breakfast casserole that’s easily customizable! I loaded mine with shredded potatohash browns, tons of fresh veggies, and a big dash of hot sauce! You can add crumbled sausage, shredded chicken, or anything else you please!

Make Ahead Veggie Breakfast Casserole Recipe | Little Spice Jar (1)

FRI-YAY!

I am so excited to be bringing you one of my all-time favorite breakfast casseroles. It’s loaded with shredded potato hash browns and tons ofsauteéd spinach, bell peppers, and mushrooms. Not only is it a cinch to whip up, but it’s also totally customizable! Be it sausage, ground chicken/turkey, shredded rotisserie chicken, or meatless – with tons of veggies like I made it. The options are endless.

Once you’ve got your protein picked out, grab your favorite cheese and start shredding.Mozzarella, swiss, and sharp cheddar are just some of the cheeses that will pair well with this casserole.

BUT BUT BUT! More reasons to make it –> you can MAKE IT AHEADand just bake it off in the morning. How good would this be for Halloween, Thanksgiving, or Christmas breakfast? A nice hearty and veggie loaded casserole that’ll keep you and the little ones going all day long.

How to make a veggie breakfast casserole:

Make Ahead Veggie Breakfast Casserole Recipe | Little Spice Jar (2)

I kind of debated whether I should actually call this a ‘breakfast casserole recipe’ as it’s more of a guideline that can easily be adapted to yourfamily’s breakfast casserole needs.

Did I mention it makes a ton? Like 10-12 servings! The hubby and I enjoyed this casserole for a couple of days but it’s one of those that actually tastes better with time. And yeah, you bet it was dinner the next day. But loaded with veggies and eggs, it’s hearty and keeps you full for hours afterward.

I spiced mine up with a whole ¼ cup of Franks hot sauce. And it gave the casserole so much flavor. If you’ve got little ones, you can cut the hot sauce back to a couple oftablespoons or leave it out altogether. But even with the ¼ cup added into the breakfast casserole, I still splashed on a little more before gobbling it down!

Make Ahead Veggie Breakfast Casserole Recipe | Little Spice Jar (3)

Let’s talk about the breakfast casserole recipe.

It’s super simple, I promise.

I sautéed the veggies separately in a skillet before layering them in. If you decide to use any kind of protein, just sauté it before adding it into the casserole.

So it starts like this – just spray a 9×13 casserole dish down with a good coating of cooking spray. We want the hash browns on the bottom to get nice and colored. Then add in the hash brown, pack them in firmly. Next, whisk the eggs, salt and pepper, milk, and if you’re using it, hot sauce, in a bowl and set it aside. Saute and add your protein +veggies on top of the potatoes and drizzle on your egg mixture. Top it with your favorite cheese and that’s it! Let it all bake up for 45 minutes and you’ve got a perfect breakfast casserole that’s great for brunch or lazy Saturday mornings.

Sometimes I like to assemble the casserole from the night before and let it come to room temperature for about 20 minutes while I enjoy a cup of coffee and bake it off in the morning.

Lazy Saturday morning breakfasts are my favorite part of the whole week.

Make Ahead Veggie Breakfast Casserole Recipe | Little Spice Jar (4)

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Yield: serves 10-12

Veggie-Loaded Breakfast Casserole

Prep Time20 minutes

Cook Time45 minutes

Total Time1 hour 5 minutes

A super simple veggie loaded breakfast casserole that's easily customizable! I loaded mine with shredded potato hash browns, tons of fresh veggies, and a big dash of hot sauce! You can add crumbled sausage, shredded chicken, or anything else you please!

Make Ahead Veggie Breakfast Casserole Recipe | Little Spice Jar (5)

Ingredients

  • 2 tablespoons oil
  • 8-10 mushrooms, sliced
  • 2 teaspoon minced garlic
  • ½ red onion, diced
  • 2 bell peppers, diced
  • 2 cups packed baby spinach, roughly chopped
  • 20 ounces shredded potatoes, thawed
  • 10 eggs
  • ⅓ cup half and half or milk (see notes)
  • ¼ cup hot sauce (more or less to taste)
  • salt and pepper
  • 1 cup shredded cheese (see notes)

Instructions

  1. In a large skillet over medium heat, heat 1 tablespoon of oil. Add the mushrooms and sauté them for 4 minutes or until they start to brown. Add a small pinch of salt along withe onions and garlic and let cook for 2 minutes. Remove to a plate. Add the second tablespoon of oil, if needed, and sauté the peppers for 1 minute. Add in the baby spinach and allow it to wilt, remove from heat, set aside.
  2. Generously spray a 9x13 baking dish with nonstick cooking spray. Lay the shredded potatoes in the bottom of the dish and press to make sure they are spread out evenly. Add the veggies (both the mushrooms and the pepper mixtures) over the potatoes, set aside.
  3. Position a rack in the center of the oven and preheat the oven to 375ºF if you are baking the casserole immediately.
  4. In a large bowl, whisk together the egg, half and half, hot sauce, and a big pinch of salt and pepper. Pour the egg mixture over the prepared veggies. Sprinkle the cheese over the topand another small pinch of salt and pepper.
  5. Bake the casserole, uncovered, until the cheese melts, and the top gets in and golden, 45-50 minutes. Allow the casserole to cool for 10 minutes before slicing and serving.

Notes

  • TO MAKE AHEAD - prepare the casserole as directed, cover with plastic wrap and refrigerate overnight or as required (not to exceed 24 hours) and allow it to come to room temperature for 20 minutes before baking.
  • The half and half can be replaced with any nondairy milk such as almond, soy, cashew, etc.
  • OTHER ADD INS - I kept this recipe vegetarian, but you can certainly add in browned sausage, ground turkey/beef, shredded chicken or ham. The cheeses I recommend for this casserole are cheddar (mild or sharp), mozzarella, and pepper jack, or swiss).

Have you made this recipe?

If you enjoyed this recipe, please consider leaving a ⭐️⭐️⭐️⭐️⭐️ rating and a comment below. You can also share a picture on Instagram with the hashtag #LITTLESPICEJAR, I'd love to see what you made!

IS THIS A GOOD CHOICE FOR YOU?

Make Ahead Veggie Breakfast Casserole Recipe | Little Spice Jar (6)

*Please note: the nutritional factscalculated are an estimate based on the ingredientsI’ve used.If you’d like a more accurate count, please calculate them using the ingredients/brands you’ve used to prepare the recipe. The nutritional factsprovided are for 1/12th of the recipe, assuming you use⅓ cup milk and cheddar cheese.

Make Ahead Veggie Breakfast Casserole Recipe | Little Spice Jar (7)

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Make Ahead Veggie Breakfast Casserole Recipe | Little Spice Jar (2024)

FAQs

Can you make a casserole with raw eggs ahead of time? ›

Can You Make Egg Casserole Ahead of Time? This easy egg casserole is the perfect make-ahead breakfast. Simply combine the ingredients the night before and place the mixture in a prepared baking dish, then cover it tightly with storage wrap or foil. In the morning, bake the casserole according to the recipe.

Can breakfast casserole be reheated? ›

After baking, leftover egg casserole can be stored in the fridge and enjoyed within 3-4 days. Leftovers are delicious reheated in the microwave.

Is it better to freeze a breakfast casserole cooked or uncooked? ›

The answer depends on what's in it. Casseroles with raw protein (meat, poultry, seafood) should be completely cooked before freezing. However dishes with pre-cooked meats or no meat are fine to go in the freezer uncooked.

Why is my breakfast casserole soggy? ›

Incorrect oven temperature - Casseroles that are baked at an oven temperature that is too low may not cook evenly, resulting in a soggy top and a firm or crunchy bottom. Too much liquid - Casseroles that have too much liquid may not be able to absorb all of the moisture, leading to a soggy top.

How long can you refrigerate a breakfast casserole before baking? ›

You can assemble the entire dish and refrigerate for up to 24 hours before baking.

Can you make a casserole with raw egg and leave it uncooked overnight in fridge? ›

An egg strata traditionally consists of layered bread, cheese, and other foods (such as cooked sausage, ham, bacon, shrimp, or vegetables) over which a mixture of raw beaten eggs and milk are poured. The casserole is covered and refrigerated overnight to allow the liquid ingredients to be absorbed into the bread.

How many days is breakfast casserole good for? ›

Store leftovers in the refrigerator up to 5 days. Reheat individual servings in the microwave as needed. Baked casserole may be frozen, up to 2 months. Thaw in refrigerator overnight and bake at 350ºF (177ºC) for about 20 minutes or until heated through.

Can I freeze a breakfast casserole with raw eggs? ›

Yes, you can. Raw eggs are fairly stable in the freezer, especially when beaten or mixed with other ingredients. Check to see what else is in the casserole, though. Hard-cooked eggs, potatoes, rice and pasta don't freeze particularly well because they break down and lose their texture.

How long can a casserole stay in the fridge before cooking? ›

8. Make it now, but bake it later. Most casseroles can be made ahead and refrigerated for a day or two or frozen up to three months.

What is the best way to reheat a breakfast casserole? ›

Cool to room temperature. Wrap tightly with foil or plastic wrap and refrigerate overnight, then reheat in a 375 F oven for 30 minutes the next morning until the casserole is browned and heated through.

How do you freeze and reheat breakfast casserole? ›

Label with date and cooking instructions (see below) and freeze for later use. Bake the remaining casserole, uncovered, until top is light golden and the center is cooked through. Serve warm. To cook the frozen casserole: Remove from the freezer and thaw in the refrigerator overnight.

Why is my egg casserole not done in the middle? ›

High heat cooks the outside faster than the inside, leaving the middle uncooked. Reducing the temperature distributes heat more evenly, allowing the middle to cook through. If uncooked in the center then cover at the same temperature and ad 15 minutes before checking again.

How do you thicken breakfast casserole? ›

Whisk together equal parts cornstarch and cold water in a small bowl. Use one tablespoon of cornstarch per cup of liquid you would like to thicken. Stir out all the lumps. A few minutes before your casserole is done, add it a little at a time until you are happy with the thickness.

How do you spice up a casserole? ›

Balance Flavors

Sweet, salty, spicy, and acidic elements should blend well and complement each other. Add ingredients like caramelized onions, olives, or lemon zest to give your casserole a depth of flavor.

How do you moisten a dry breakfast casserole? ›

Covering the dish will trap the steam in and keep it moist while it heats. How do you moisten a dry casserole? Add a little water or milk to the top of the it before reheating.

Can you leave raw egg mixture in fridge? ›

If you've got raw egg yolks or whites left over from a recipe which you don't want to waste (let's face it, why would you?), you can store them in the fridge as long as you plan to use them within the next few days.

Can you pre cook eggs the night before? ›

You can prepare eggs in advance to eat throughout the week. Eggs can last for several days in the fridge or for several months when frozen. There's a huge variety of egg-based dishes to choose from, and many of them can be meal prepped.

Can you put an uncooked casserole in the fridge? ›

Unless food will be frozen, it's safest and will provide the best quality product to start preparing most perishable foods no more than a day before a meal. For example, assemble a vegetable casserole a day in advance, refrigerate and then bake the day of your dinner.

How long should you keep a raw egg dish? ›

Only keep raw egg dishes for one day and refrigerate at all times. Time spent at room temperature is bacteria's best friend. Wash your hands with soap and water after handling uncooked eggs so there is no risk of transferring bacteria from the eggshell surface to other foods in the kitchen.

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