This Cheesy Sausage Breakfast Casserole Is the Ultimate Make-Ahead Meal (2024)

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Kristina Vänni

Kristina Vänni

Internationally recognized culinary authority Kristina Vänni is a well-known food writer, engaging TV host, award-winning recipe developer, food stylist, and photographer. In addition to writing for industry-leading websites including Better Homes and Gardens, The Spruce Eats, and Food52, she has been a featured expert on national media such as ABC News’ “World News Tonight” and CBS’ “The Talk” and has served as a spokesperson and recipe developer for national brands such as Finlandia, KitchenAid, Post Foods, Baileys, among many others. Kristina is currently writing her first cookbook, an exploration of the traditional and seasonal cuisine from her family's dairy farm in Finland. Kristina enthusiastically shares her creative content, behind-the-scenes peeks, and industry expertise with food enthusiasts on Instagram, Facebook, and Twitter.

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published Sep 27, 2022

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This Cheesy Sausage Breakfast Casserole Is the Ultimate Make-Ahead Meal (1)

Nothing beats a homemade breakfast casserole fresh from the oven.

Serves6Prep15 minutesCook30 minutes to 50 minutes

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This Cheesy Sausage Breakfast Casserole Is the Ultimate Make-Ahead Meal (2)

A great make-ahead breakfast casserole is the perfect back-pocket recipe for when you’re hosting overnight guests. Do all the work the night before, then pop it in the oven the next morning for a decadent and special occasion-worthy meal. Your guests will love that you went the extra mile to make them feel special, and no one has to know how easy it was to prepare!

I like to think of this recipe as a “choose your own adventure” breakfast casserole. Keep in mind a few key ratios, but substitute ingredients based on what you have or what you’re craving.

Key Ingredients in this Breakfast Casserole

  • Crusty bread: Day-old bread also works great here, as it will absorb the eggs and milk in the casserole. This becomes the first layer of the casserole in the baking dish.
  • Protein and veggies: Here I sautéed some green onion with bulk breakfast sausage, but you can also use this as an opportunity to repurpose leftover ingredients. Cubed leftover ham is a great choice, as are broccoli florets and sliced mushrooms for a vegetarian option.
  • Shredded cheese: Cheddar is always a solid choice, but I think melty and delicious Fontina is also a great option. If you want a spicy kick, try pepper Jack cheese.
  • Eggs and milk: For 8 ounces of bread, you will need 6 large eggs and 1 cup of milk to hold everything together.
  • Herbs and seasoning: I love smoked paprika, so that’s what I added here. But feel free to get creative and use your favorite herbs or seasoning to make the casserole your own.

Why Is My Breakfast Casserole Runny?

The key to a breakfast casserole that is moist and delicious but not runny is to make sure you have the proper ratio of bread, eggs, and milk. If there is too much liquid for the bread to absorb, the result could be a runny casserole. This is why I like a firmer bread like a crusty French bread or a baguette rather than something softer, like challah. I have found the ratio of about 8 ounces of cubed bread, 6 eggs, and 1 cup of milk works well for breakfast casseroles.

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Breakfast Casserole

Nothing beats a homemade breakfast casserole fresh from the oven.

Prep time 15 minutes

Cook time 30 minutes to 50 minutes

Serves 6

Nutritional Info

Ingredients

  • 8 ounces

    crusty French bread or baguette

  • 4 teaspoons

    olive oil, divided

  • 2

    medium scallions

  • 4 ounces

    cheddar cheese

  • 8 ounces

    uncooked breakfast sausage

  • 6

    large eggs

  • 1 cup

    whole milk or 2% milk

  • 1 teaspoon

    smoked paprika, plus more for sprinkling

  • 1/2 teaspoon

    kosher salt

  • 1/4 teaspoon

    freshly ground black pepper

Instructions

  1. Drizzle a 2-quart baking dish, such as an 8-inch square, with 2 teaspoons of the olive oil. Cut 8 ounces crusty French bread or baguette into 1-inch cubes. Place in the baking dish and arrange into an even layer.

  2. Thinly slice 2 medium scallions, keeping the dark green parts separate from the white and light green parts. Grate 4 onces sharp cheddar cheese on the large holes of a box grater (about 1 cup). Remove 8 ounces uncooked breakfast sausage from the casings if needed.

  3. Heat the remaining 2 teaspoons of olive oil in a large skillet over medium-high heat until shimmering. Add the sausage and white and light green scallion parts. Cook, breaking up the sausage into bite-sized pieces with a wooden spoon, until the sausage is browned and cooked through, about 5 minutes. Transfer the sausage mixture evenly over the bread. Sprinkle with the cheese.

  4. Place 6 large eggs, 1 cup whole milk or 2% milk, 1 teaspoon smoked paprika, 1/2 teaspoon kosher salt, and 1/4 teaspoon black pepper in a large bowl and whisk until combined. Pour evenly over the bread mixture. Press down on the bread so it soaks up the liquid. Cover and refrigerate for at least 8 or up to 24 hours. (Alternatively, the casserole can be baked right away: Let it sit at room temperature while the oven heats so the bread has time to absorb the custard.)

  5. Arrange a rack in the middle of the oven and heat the oven to 350ºF. If the casserole has been refrigerated, let it sit at room temperature while the oven is heating.

  6. Uncover and bake until lightly browned on top and a tester inserted into the center comes out clean, 30 to 50 minutes. Let cool for 5 minutes before serving. Sprinkle with more paprika and garnish with the reserved dark green scallion parts.

Recipe Notes

Storage: Leftovers can be refrigerated in an airtight container for up to 4 days. The casserole can also be cut into portions, tightly wrapped, and frozen for up to 3 months.

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This Cheesy Sausage Breakfast Casserole Is the Ultimate Make-Ahead Meal (2024)

FAQs

How long can I refrigerate an egg casserole before baking? ›

Whisk the eggs, salt, pepper, milk, and cheese together. Evenly pour over sausage/vegetable mixture. Add another sprinkle of salt and pepper on top. Cover casserole with plastic wrap or aluminum foil and refrigerate for at least 30 minutes and up to 24 hours.

Do you freeze breakfast casserole before or after baking? ›

Cover the casserole and store it (unbaked) in the refrigerator overnight or up to one day. Bake in the morning, according to recipe instructions. To freeze breakfast casserole prepare the recipe and add to your pan. Cover well with plastic wrap and then tinfoil and freeze for 2-3 months.

How long to reheat breakfast casserole in oven? ›

Bake the casserole for only 30 minutes. 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.

Why is my breakfast casserole soggy? ›

Your vegetables could be to blame

According to Allrecipes, the vegetables you selected are the most common culprit for your watery casserole, due to the high percentage of moisture that some of them contain in their raw form which seeps out as they cook down in your dish.

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.

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 cook casserole the day before or? ›

Putting a casserole together a day or so before baking ensures that everything is ready to go when dinner time rolls around. That means no rushing at the last minute. Along with greater convenience, making a casserole ahead of time also results in a richer, deeper taste.

Can you freeze casserole including raw eggs to cook later? ›

To be on the safe side, you might want to let the cooked ingredients cool, before you mix in the egg. Since you can freeze raw eggs, I see no reason you couldn't freeze a casserole that contains them. Make sure all your ingredients are cold before putting in the freezer, or adding the eggs.

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

Can I cook two casseroles in the oven at the same time? Of course you can, put them in side by side, midway through cooking turn them both around, if you can't get them side by side put one on top rack and one on the bottom rack, midway through cooking switch racks and turn them around.

How do you know when breakfast casserole is done? ›

However, when it comes to knowing definitively that your casserole is done, Kitchen Seer states there is really only one way: A food thermometer. You will need to ensure the internal temperature is at a minimum of 165 degrees F. If you don't have a thermometer, it may be time to invest in one.

How many days can you eat breakfast casserole? ›

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.

How do you thicken breakfast casserole? ›

Make a cornstarch slurry for a fast and easy thickener.

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. Then, let the casserole finish baking.

Why is my sausage casserole watery? ›

Don't cover all ingredients with stock or you will have too much water when it starts to cook down. Like some other posters have said, corn flour or regular plain mixed and smoothed with water to a thick consistency prior to adding to the casserole will help thicken it.

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.

How long can a premade casserole stay in the fridge? ›

The following foods will keep 3 to 4 days in the refrigerator: Fully cooked ham slices. Cooked meat and meat casseroles. Cooked chicken and chicken casseroles (Learn more about how to tell if chicken is bad)

How long does it take a refrigerated casserole to come to room temp? ›

How long does it take a refrigerated casserole to come to room temp? Depending on the size of the dish and the density of its contents, it takes about an hour for to come up to room temperature. Add more time for a larger pan or one with dense contents.

How long can you refrigerate casserole? ›

The United States Department of Agriculture recommends using cooked leftovers within 3 to 4 days. Refrigeration slows but does not stop bacterial growth.

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