This easy Hashbrown Breakfast Casserole recipe is loaded with sausage, hashbrowns, bell peppers, onion, and cheese. We love that you can make it ahead of time and refrigerate overnight, so it's ready to bake anytime.
Combine eggs, sour cream, milk, cheese, and salt and pepper in a large bowl. Mix on low speed with electric mixers, just until combined. Stir in thawed hash browns.
Cook sausage: Heat a large skillet over medium heat. Add sausage and cook until browned, breaking it into small pieces with a wooden spoon as it cooks. Drain most of the grease and add the sausage to the bowl with the egg mixture.
Saute veggies: Add the bell peppers and onion to the same skillet the sausage was cooked in and sauté for 2- 3 minutes. Add to the bowl with the egg mixture and stir everything to combine.
Bake: Pour mixture into a greased 9x13’’ pan. Cover dish and refrigerate overnight, or bake immediately at 350 degrees for 40-50 minutes or until the edges are set and the center is just barely jiggly.
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Notes
Make Ahead Instructions: Follow recipe instructions to assemble the hash brown breakfast casserole then cover and refrigerate for up to 1-2 days before baking (depending on freshness of ingredients used).To Store: Keep covered in the refrigerator for up to 4 days. Reheat in the microwave.To Freeze (unbaked): Follow recipe instructions to assemble then cover unbaked casserole with aluminum foil and freeze for 2-3 months. Thaw completely in the refrigerator thing bring to room temperature on the counter before baking according to recipe instructions.