Creating Tater Tot Taco Casserole is straightforward. Follow these steps for an effortless cooking experience:

1. Preheat the Oven: Start by preheating your oven to 375°F (190°C).
2. Cook the Meat: In a skillet over medium heat, brown the ground beef (or turkey) and onion until fully cooked. Drain any excess fat.
3. Season the Meat: Stir in the taco seasoning, black beans, and corn. Mix well and cook for about 2-3 minutes.
4. Add Tomatoes: If using, stir in the diced tomatoes with green chilies, mixing until they are combined.
5. Layer the Casserole: In a greased 9×13-inch baking dish, spread the meat mixture evenly across the bottom.
6. Add Cheese: Sprinkle half of the shredded cheddar cheese over the top of the meat mixture.
7. Top with Tater Tots: Arrange the frozen tater tots in a single layer over the cheese, covering the entire surface.
8. Bake: Place the casserole in the preheated oven and bake for 25-30 minutes, or until the tater tots are golden brown and crispy.
9. Add Remaining Cheese: Remove the casserole from the oven and sprinkle the remaining cheddar cheese on top. Return it to the oven for an additional 5 minutes until the cheese is melted.
10. Cool and Serve: Allow the casserole to cool slightly before serving. Garnish with sliced green onions if desired.

These simple steps will guide you in creating a delicious Tater Tot Taco Casserole that everyone will love.