Preheat the oven to 375 degrees F (190 degrees C). Grease an 11x13-inch baking dish with cooking spray.
Place cubed potatoes in a large microwave-safe bowl and partially cover with a lid. Microwave on high for 4 minutes. Remove from the microwave and spread on the bottom of the prepared baking dish.
Heat a large skillet over medium-high heat. Cook and stir breakfast and chorizo sausage in the hot skillet until browned and crumbly, 5 to 7 minutes. Drain and discard grease. Add bell peppers, onion, and mushrooms. Saute until bell peppers and onion are softened, about 5 minutes. Spread mixture over the potatoes.
Beat eggs in a bowl and add milk. Pour beaten eggs over everything in the baking dish and move around a bit with a spoon to evenly disperse. Sprinkle Cheddar cheese over top until well covered. Cover with aluminum foil.
Bake in the preheated oven for 30 minutes. Remove foil and bake until egg is set, about 1 more hour. If cheese starts to brown too much, cover again with foil for the rest of the baking time.
Nutritional Facts
Per 12 servings
Calories: 440
Carbohydrate: 20g
Fat: 28g
Fiber: 3g
Protein: 26g
Sugar: 3g
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