Breakfast Sausage and Egg Casserole (Without Bread)

A Sausage & Egg Casserole That Works for Christmas Brunch or Busy Mornings

I love a good casserole. Not tuna noodle casserole from the 90’s. Trust me, I’ve had my fair share of that growing up.

Instead, I’m talking about an egg casserole, frittata, egg strata (egg casserole with bread), oatmeal casserole (also called baked oatmeal), or french toast casserole.

Casseroles are a budget-friendly way to prep breakfast in advance for the whole week or feed a crowd at a baby shower, holiday brunch, or Christmas breakfast.

This casserole recipe is versatile, working for both holiday mornings and a quick weekday breakfast. That’s one of the many reasons why I love this egg breakfast casserole.

Step by Step Instructions

Preheat the oven to 350F.

Spray your casserole dish with nonstick cooking spray (I like avocado oil spray) or grease with oil or butter to prevent the egg casserole from sticking to the bottom of the pan. No need to do this if baking the casserole in the skillet used to brown the potatoes and sausage.

Step 1: Prepare the Sausage, Potatoes, and Green Onions

• In a large skillet, over medium-high heat, melt the butter.
• Once melted, add the sausage and break it up with a wooden spoon to create crumbles.
• After about 3 minutes, stir in the diced potatoes. Cover the skillet and cook until the sausage is brown and the potatoes begin to sweat and soften (about 8-10 minutes).
• Add the spinach to the skillet and continue to cook the greens, uncovered, for about 2 minutes until wilted.
• Stir in the chopped green onions.
• Pour the veggie and sausage mixture into a casserole dish, spread it out in an even layer.

Step 2: Combine the Eggs, Cheese, and Seasonings

• In a medium-size bowl, whisk the eggs, milk, cheese, fresh herb, salt, and pepper.
• Pour the egg mixture over the top of the cooked sausage mixture.

Variations and Substitutions

• Use a Sweet Potato: Instead of using a white potato, use chopped sweet potatoes instead.
• Use a Plant-Based Milk: Instead of using dairy milk, use an unsweetened almond milk or coconut milk.
• Use Nutritional Yeast: If you need to make this casserole dairy-free, use a dairy-free cheese or add 2 tablespoons of nutritional yeast to the eggs instead of real cheese. Nutritional yeast is commonly used to mimic the taste of cheese in dairy-free recipes.
• Skip the Fresh Herb: I love adding fresh herbs to a sausage egg bake or frittata (this frittata recipe with bacon and vegetables is amazing). Herbs add extra flavor to egg dishes. If you don’t have fresh herbs on hand, you can still make the perfect breakfast casserole without this fragrant ingredient.

Make Ahead & Quick Breakfast Meal Prep Tips

• Quick Meal Prep Breakfast: Allow the casserole to cool, then cut into squares and place in an airtight container (or individual meal prep containers, and later add fruit or yogurt for a grab-n-go breakfast). Store in the fridge for up to 4 days. Serve at room temperature or reheat.
• Make-Ahead Holiday Breakfast: Cook the sausage and veggie mixture up to 1-2 days in advance and store the cooked ingredients in the fridge. Then follow the remaining instructions when you’re ready to assemble and bake the casserole. Another option is to prep the entire casserole 12 hours before baking (the night before), store the casserole in the fridge (covered), then bake according to the instructions the next day.

How to Store Leftovers

• Store leftovers directly in the casserole dish, tightly covered with foil or plastic wrap, for up to 2 days in the fridge.
• Or slice the leftover casserole into squares and store in an airtight container for up to 4 days in the fridge.

How to Reheat Leftovers

Reheat individual slices or squares of casserole in the microwave for just a few seconds (30-45 seconds) or in the oven at 300F until warmed through.

What to Serve With This Cheesy Sausage Egg Casserole

The casserole may be served on its own or paired alongside a delicious breakfast side. Here are a few ideas for a weekday breakfast or holiday gathering. Check out 21 sides to serve with breakfast casserole here.

• Yogurt Bowls (great to make in advance for a quick breakfast)
• Chocolate Protein Yogurt
• Sourdough Toast
• Overnight Oats: make the oats high protein, with frozen fruit, or add a tropical twist with coconut milk.
• Peanut Butter and Banana Toast
• Salad with Vinaigrette Dressing (great for a holiday brunch or lunch)
• Melon Prosciutto Salad (great for a baby shower or holiday brunch)
• Yogurt Dip (serve alongside fruit, like berries, for a baby shower or brunch)
• Fresh Fruit (berries, oranges, apples, grapefruit, banana, etc.)
• Einkorn Cinnamon Rolls (made with einkorn flour so they’re healthier and easy to digest)
• Fluffy Einkorn Biscuits
• Fruit Salad (mix a variety of different fruits together)
• Croissants
• Muffins (I love almond flour banana muffins, einkorn muffins, or pumpkin einkorn muffins)
• Einkorn Blueberry Scones
• Einkorn Coffee Cake
• Einkorn Pumpkin Scones
• Quick Bread (I love almond flour banana bread or almond flour pumpkin bread)
• Bagels and Cream Cheese
• Pancakes (I love sheet pan einkorn pancakes, almond-oat pancakes, or traditional einkorn pancakes)
• Waffles (I love almond flour waffles or einkorn waffles)