Preheat your oven to 350°F (175°C). Grease a 9×13 inch baking dish with nonstick spray.

Cook bacon in a skillet over medium heat until crispy, then drain on paper towels, reserving the fat.

In the same skillet, sauté diced onions and bell peppers in the reserved bacon fat until tender (about 5 minutes).

In a large bowl, whisk together eggs, milk, salt, and pepper until frothy.

Crumble the cooked bacon into the egg mixture along with sautéed vegetables and shredded cheese; stir gently to combine.

Pour the mixture into the prepared baking dish and spread evenly. Bake for 30-35 minutes or until puffed up and golden brown.