PREPARATION:

Cook Sausage and Vegetables: Cook the sausage in a skillet until browned and crumbled. Sauté the onions and bell pepper (if using) in the same skillet until softened.
Assemble the Pie: Spread the cooked sausage in a greased pie dish. Top with the sautéed vegetables and shredded cheeses.
Prepare Egg Mixture: Whisk together the eggs, half-and-half, flour, baking powder, salt, and pepper.
Pour Egg Mixture: Pour the egg mixture over the sausage and cheese in the pie dish.
Bake: Bake the pie in a preheated oven at 350°F (175°C) for 35-40 minutes, or until set.
Serve: Let the pie cool slightly before serving. Garnish with green onions or chives if desired.