Prep equipment: Preheat the oven 350 F. Butter or spray a 9×13 casserole dish with non-stick cooking spray. 

Brown sausage: Heat a medium skillet over medium-high heat and add the breakfast sausage. Break apart with a wooden spatula and cook until the sausage has browned, about 6-8 minutes. Remove sausage from the skillet and set aside in a bowl to cool. Drain excess grease in the pan if needed. 

Whisk egg mixture: While the sausage is cooking, in a large bowl whisk together eggs, half and half and ricotta cheese until smooth.

Saute vegetables: Add the onion and bell pepper to the sausage skillet. Cook on medium heat for 5-6 minutes, or until the onion is translucent and the bell pepper is tender. Cool slightly.

Combine meat, cheese and eggs: Once cooled, add the sausage, onion and pepper mixture and shredded cheese to the eggs. Stir everything together until well combined. 

Bake: Transfer egg mixture to prepared casserole dish and bake for 40-50 minutes or until the top is golden brown and the center is nearly set in the middle when the pan moves. Cool for 10 minutes before serving.