Breakfast Casserole

August 2024 · 6 minute read

This breakfast casserole recipe is perfect for feeding a crowd. Filled with potatoes and veggies, it's hearty, delicious, and easy to make ahead!

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Breakfast casserole

A breakfast casserole is the best way to feed a crowd first thing in the morning. Just ask my mom! She’s been making her famous breakfast casserole recipe on Easter and Christmas morning for as long as I can remember. The rest of my family loves it because it’s hearty and flavorful, packed with potatoes, veggies, eggs, and cheese. My mom loves it because it’s easy to make and—even better—make ahead. She can prep the whole thing the night before and pop it in the oven when guests arrive the next day.

I adapted this breakfast casserole recipe from hers, and it checks all the same boxes.

  • You can make it ahead.
  • It’s simple to throw together.
  • It’s satisfying and delicious.
  • And you can adapt it to use different cheeses or vegetables.
  • We love this recipe, and I hope you do as well! It’s perfect for special occasions, but it’s so tasty that you might want it in your regular breakfast rotation too.

    What’s In This Easy Breakfast Casserole

    This breakfast casserole recipe has 4 main parts:

    Find the complete recipe with measurements below.

    Recipe Variations

    Like my frittata recipe or crustless quiche, this breakfast casserole is adaptable! Here are a few ways to change it up:

    How to Make This Breakfast Casserole

    This breakfast casserole recipe is easy to make! You can find the complete recipe with measurements at the bottom of this post, but for now, here’s an overview of how it goes:

    First, roast the potatoes. Chop them into 1/4-inch cubes. Note: This is small! Smaller cubes=more crisp, golden brown edges. Be careful not to cut them too large.

    Place the chopped potatoes on a parchment-lined baking sheet, and toss them with olive oil, salt, and pepper. Roast at 425°F for 20 to 25 minutes, or until tender and browned.

    Meanwhile, prep the egg mixture. Whisk together the eggs, milk, and 1/4 teaspoon salt in a large bowl. Set aside.

    Next, cook the veggies. Sauté the onion until soft, and then add the peppers and garlic. Cook for 2 minutes before adding the spinach and half the green onions. Cook until the spinach is just wilted.

    Then, assemble the casserole. Spread the roasted potatoes at the bottom of an oiled 9×13-inch baking dish. Top with two-thirds of the cheese, followed by the sautéed veggies.

    Pour in the egg mixture. Finally, sprinkle the remaining cheese and reserved green onions on top.

    Bake the casserole at 350°F until the eggs are set, 40 to 45 minutes. Let stand for 5 minutes before slicing and serving. Enjoy!

    Make-Ahead Breakfast Casserole

    One of my favorite things about this egg casserole recipe is that you can make it ahead. No need to get up at the crack of dawn in order to have it ready in time for brunch!

    Here are two options for prepping it in advance:

  • Assemble the casserole the night before. Like a french toast casserole, this breakfast casserole can be assembled a day ahead. Layer the potatoes, vegetables, cheese, and egg mixture in the pan, and tightly cover with foil or plastic wrap. Refrigerate overnight. The next morning, uncover and let sit at room temperature while you preheat the oven. Then, bake according to the recipe.
  • Cook the components the day before and assemble in the morning. Roast the potatoes and sauté the veggies a day ahead, and store them in airtight containers in the fridge. With these components prepped, the egg casserole is quick and easy to assemble day-of.
  • Storing and Reheating Leftovers

    If you have leftover breakfast casserole, you’re in luck. It reheats perfectly! Store slices in an airtight container in the fridge for up to 3 days, and warm them in the microwave before serving.

    You can also freeze this breakfast casserole. Wrap slices tightly in foil or plastic wrap, or seal them in an airtight container. Freeze for up to 3 months. Allow to thaw overnight in the fridge before reheating.

    What to Serve with Breakfast Casserole

    This easy make-ahead breakfast casserole recipe is flavorful and filling, so you don’t need to pair it with much more than fresh fruit for a satisfying breakfast.

    That said, it’s a wonderful addition to a larger brunch. Try pairing it with any of these recipes:

    Looking for more brunch ideas? Check out these 51 Best Brunch Recipes!

    Breakfast Casserole

    rate this recipe:4.97 from 29 votesPrep Time: 15 minutes Cook Time: 1 hour Total Time: 1 hour 15 minutes Serves 12Save Recipe Print RecipeThis easy breakfast casserole recipe is perfect for feeding a crowd! It's hearty and flavorful, filled with roasted potatoes, veggies, eggs, and cheddar cheese. Find make-ahead instructions in the blog post above.

    Equipment

    Ingredients

    For the potatoes

    For the casserole

    Instructions

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