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.