Allow the casserole to cool for a few minutes before serving.
Variations & Tips
For a bit of a kick, add a teaspoon of crushed red pepper flakes or a diced jalapeño to the beef mixture. You can also substitute the ground beef with ground turkey or chicken for a lighter version. If you prefer a different cheese, try Monterey Jack or a spicy pepper jack for added flavor. For a vegetarian option, omit the beef and add more vegetables like zucchini or mushrooms.