Set your oven to 375°F (190°C). Grease a 9×13-inch baking pan with butter or cooking spray so your casserole won’t stick and will serve easily.
Step 2: Cook Beef and Aromatics
In a large skillet over medium-high heat, brown the ground beef until fully cooked (about 5–7 minutes). Drain excess fat.
Add the minced garlic and chopped onion to the skillet and sauté for 3–4 minutes until the onion becomes translucent and fragrant. This boosts the flavor of the beef base.
Step 3: Mix Ingredients
In a large bowl, combine the cooked beef mixture with corn, black beans, cream of mushroom soup, shredded cheese, milk, and sour cream. Stir until well blended—this will be the flavorful heart of your casserole.
Step 4: Layer in Baking Dish
Spread the mixture evenly in your prepared baking pan. Proper layering ensures consistent cooking and flavor in every bite.
Step 5: Add Tater Tot Topping
Arrange the frozen tater tots in a single layer on top of the casserole. They’ll bake into a crunchy, golden topping while soaking up the delicious flavors beneath.
Step 6: Bake
Place the casserole in the oven and bake for 45–50 minutes. You’ll know it’s done when the tater tots are golden brown and the casserole is bubbly around the edges.
Step 7: Serve
Let the casserole cool for a few minutes before serving—this helps it set and makes it easier to cut. Optional: sprinkle with chopped parsley or green onions for a fresh, colorful touch.
