Brown the ground beef in a skillet over medium heat, then add onion and garlic and cook until softened. This builds the base flavor of the casserole and ensures the meat is fully cooked.
Stir in vegetables and seasonings, cooking briefly to combine flavors while keeping vegetables slightly firm for better texture after baking.
Mix the sauce ingredients separately, then combine with the beef mixture to create a creamy, cohesive filling.
Transfer the mixture into a baking dish and spread evenly, then add a layer of cheese to enhance richness throughout.
Arrange tater tots in a single layer on top and bake until crispy and golden for the perfect texture contrast.
Add remaining cheese and bake briefly until melted and bubbly for a finished, comforting dish.
