Cook sausage in a large skillet over medium 8-10 minutes until browned and crumbly; drain and cool slightly.
Grease a 9x13-inch dish with spray or oil.
Layer half the tortillas, sausage, beans, corn, pepper, 1 cup cheese, then remaining tortillas.
Whisk eggs, milk, chili powder, cumin, garlic powder, salt, and pepper in a large bowl until slightly frothy.
Pour evenly over filling; press gently to soak tortillas.
Cover with plastic; refrigerate at least 3 hours or overnight.
To freeze chilled casserole, cover tightly with plastic and foil; freeze up to 3 months and thaw completely refrigerated overnight before baking.
Heat oven to 350°F; remove plastic and cover with foil. Bake 35 minutes; uncover, add remaining 1 cup cheese, and bake 10-15 minutes until melted and bubbly.
Rest 5-10 minutes; serve with preferred salsa, sour cream, avocado, or cilantro.