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? ›

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.

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.

Can breakfast casserole be reheated? ›

Breakfast casserole is an all-in-one hearty meal that can be made ahead of time, feeds a crowd, reheats well, and makes great leftovers.

How do you reheat hash brown casserole? ›

Leftovers should be refrigerated in an airtight container and are best if used within 3 days. You can also freeze leftovers, they're best if used within 3 months. To reheat, let it defrost in the refrigerator and bake it in a 350° oven, covered, for 20-25 minutes.

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

You can either bake breakfast casserole immediately or cover the dish with plastic wrap or foil and refrigerate for up to 24 hours to bake later.

How long to cook an uncooked casserole that has been refrigerated? ›

For example, assemble a vegetable casserole a day in advance, refrigerate and then bake the day of your dinner. Plan 15 to 20 minutes additional heating time for the refrigerated cold casserole. Heat until it's hot and steamy throughout (165 °F as measured by a food thermometer).

Can you bake two breakfast casseroles at the same time? ›

Yes. Most people fret when it comes to cooking two dishes at once, but it's your oven's job to keep the internal temperature set to what you selected. It may have to work a little harder when two or more cold dishes are inserted but trust that it will do its job.

Can you cook a casserole the day before? ›

One of the advantages of casseroles is that you can cook them in advance. If possible, make your casserole one day ahead and store in the fridge – this intensifies the flavours of the dish. To freeze ahead, cool the cooked casserole, then freeze in an airtight container for up to three months.

Why is my breakfast casserole runny? ›

This is often due to high water content in some vegetables and dense meats that are used in these dishes. Browning /cooking the meats (and draining off any excess liquid) and sautéing the vegetables before cooking often helps this issue.

Why is my hash brown casserole soggy? ›

Frozen hash browns will leak moisture during cooking, which could leave a soggy, sad mess behind. For the best results, let the frozen hash browns thaw overnight in the fridge, then thoroughly pat them dry to remove as much moisture as possible before cooking them to crispy.

How do you reheat a refrigerated casserole? ›

I would set the oven to 300 with the leftover casserole in the oven, don't preheat if you are taking it straight from the fridge, put a little water in the bottom and cover it with either foil, or the lid that goes with the dish and in about 20 to 30 minutes it should be heated through.

How long to reheat sausage casserole in the oven? ›

It is highly important to heat your Sausage Casserole thoroughly killing any toxic and harmful bacteria. This can be done on the top of your stove, or in your oven for around 30 minutes until piping hot.

Can you leave raw egg mixture in the 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.

How long can raw eggs sit out before baking? ›

According to the American Egg Board, you can leave eggs on the counter about 2 hours at room temperature (or 1 hour if the temperature is 90°F or hotter). After 2 hours, you'd be safer to throw those eggs out and get a fresh dozen rather than chance it.

Can you scramble raw eggs the night before? ›

Make it the night before, then just reheat in the morning. To make these eggs even more special, put them in puff pastry shells. But they are delicious on their own, served with sausage or bacon and some fresh fruit, coffee, and orange juice.

Can you prep eggs in advance? ›

You can choose your favorite way to eat eggs and prepare them for the week ahead. You can boil, fry, or even freeze them. And, of course, you can cook egg-based dishes like omelettes, frittata, or egg casseroles. Then simply freeze them, and you'll have ready-made, delicious meals that you only need to reheat.

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