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 breakfast casserole be refrigerated before cooking? ›

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.

Can you reheat a cooked 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.

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 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.

Why do you have to refrigerate breakfast casserole overnight? ›

The USDA recommends that cooked eggs and egg dishes should be refrigerated within 2 hours of cooking and consumed within 3-4 days. Leaving cooked eggs out overnight at room temperature increases the risk of bacteria growth, which can lead to food poisoning.

Can I leave an 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 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.

Can you make egg casserole 2 days ahead without? ›

Yes, you can make this breakfast casserole a day ahead, or freeze it to bake another day! To make one day ahead of time, prepare everything as directed, up until baking. Cover the casserole and store it (unbaked) in the refrigerator overnight or up to one day.

Why is my breakfast casserole soggy? ›

Pre-cook the veggies. Veggies are naturally watery. As they cook, they release that moisture. If they only cook in the casserole, all that extra moisture will also be IN your casserole.

How do you reheat egg sausage casserole? ›

Microwave in 30-60 second increments until warmed to your liking - usually, 2 minutes is more than enough time to make your casserole piping hot!

Why is my breakfast casserole dry? ›

Probably 2 things: you're not using enough sauce, and you're baking it uncovered. Possibly the sauce you're using is too dry as well.

Can I freeze a breakfast casserole with raw eggs? ›

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.

Should you bake a casserole covered or uncovered? ›

In general, you'll want to bake a casserole covered with aluminum foil for most of the cooking time. Covering the casserole helps lock in moisture and prevents it from drying out. If you don't cover the casserole or uncover it too soon, the casserole will dry out.

How do you store and reheat breakfast casseroles? ›

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 long can you keep a casserole in fridge before baking? ›

Whether you pre-cook the casserole or not, let it thaw overnight in the refrigerator before baking it in the oven for the best results. You can place the casserole into a dish in the fridge for up to 36 hours to allow it to thaw and then proceed to follow the dish's original cooking instructions.

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 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 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.

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