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Easy Cheesy Egg Bake

This cozy egg bake is packed with savory beef sausage, tender vegetables, creamy eggs, and cheese, creating a warm, hearty dish perfect for brunch or a comforting dinner.
Prep Time 15 minutes
Cook Time 1 hour
Total Time 1 hour 15 minutes
Course Breakfast, Brunch
Cuisine American
Servings 8 servings
Calories 340 kcal

Ingredients
  

Main Ingredients

  • 1 tablespoon olive oil
  • 1 pound uncooked beef breakfast sausage (casings removed if needed)
  • 1 medium yellow onion, diced (about 1 1/2 cups)
  • 1 medium red bell pepper, diced (about 1 1/2 cups)
  • 1.5 teaspoons kosher salt, divided
  • 3 ounces baby spinach (about 3 packed cups)
  • 12 large eggs
  • 2 cups half-and-half
  • 1 tablespoon Dijon mustard
  • 0.5 teaspoon freshly ground black pepper
  • 20 ounces frozen shredded hash brown potatoes (about 6 1/2 cups, do not thaw)
  • 6 ounces sharp cheddar cheese, shredded (about 1 1/2 cups), divided

Instructions
 

Preparation

  • Heat the oven to 375°F and lightly coat a 9×13 inch baking dish with cooking spray or oil.
  • Heat the olive oil in a large skillet over medium heat until shimmering. Add the beef breakfast sausage and cook, breaking it into small pieces, until no longer pink, 6 to 8 minutes.
  • Stir in the diced onion, diced red bell pepper, and 1/2 teaspoon of the kosher salt. Cook, stirring occasionally, until the onion softens, 3 to 5 minutes.
  • Stir in the baby spinach and cook until wilted, about 1 minute. Transfer the mixture to the baking dish.
  • In a large bowl, whisk the eggs, half-and-half, Dijon mustard, the remaining 1 teaspoon kosher salt, and the black pepper until fully combined.
  • Add the frozen shredded potatoes and half of the cheddar cheese (about 3/4 cup) to the baking dish. Stir gently to combine and spread into an even layer.
  • Pour the egg mixture evenly over the potato mixture. Tilt the dish slightly if needed to distribute the liquid evenly.
  • Sprinkle the remaining 3/4 cup cheddar cheese over the top.
  • Bake for 55 to 60 minutes or until a knife inserted in the center comes out clean and the top is lightly golden brown. Let cool for 5 minutes before serving.

Notes

If your hash browns are frozen into clumps, tap the unopened bag against a hard surface to break them apart easily. Swap cheddar for Monterey Jack or Swiss for a different flavor profile. Add mushrooms or zucchini if you want extra vegetables; sauté them first to avoid excess moisture. Store leftovers in the refrigerator for up to four days and reheat gently for the best texture.
Keyword Breakfast Casserole, Cheesy Eggs, Comfort Food, Egg Bake, Sausage Bake