Preheat your oven to 350°F. Lightly grease a 9×13-inch baking dish with cooking spray.
In a large mixing bowl, whisk together eggs, sour cream, milk, half of the cheddar cheese, salt, and pepper until well combined.
Cook the pork sausage in a large skillet over medium heat, breaking it apart with a wooden spoon, until browned and crumbly. Drain excess grease.
Using the same skillet, sauté the diced green and red bell peppers, and green onions for 2-3 minutes, just until softened.