This Southwestern Egg Casserole is a delicious and hearty breakfast dish that is perfect for feeding a crowd. Packed with flavorful ingredients like bell peppers, onions, black beans, and corn, this casserole is a fiesta in every bite. The eggs are mixed with milk and spices, then poured over the vegetables and cheese. Baked until golden and set, this casserole is a satisfying and protein-packed way to start your day. Serve it with salsa, avocado, and sour cream for a complete Southwestern breakfast experience.