Creating Cheesy Tater Tot Casserole is a breeze when you follow these simple steps:

1. Preheat the Oven: Preheat your oven to 350°F (175°C). Grease a 9×13 inch baking dish with cooking spray or butter.
2. Cook Meat: If using ground beef or sausage, cook it in a skillet over medium heat until browned. Drain excess grease and set aside.
3. Mix Ingredients: In a large mixing bowl, combine the sour cream, cream of chicken soup, garlic powder, onion powder, salt, and pepper. Stir until well combined.
4. Add Vegetables and Meat: Fold in the cooked meat (if using), diced onions, and frozen mixed vegetables into the soup mixture.
5. Layer Ingredients: Spread the mixture evenly in the prepared baking dish. Top with a generous layer of shredded cheddar cheese.
6. Add Tater Tots: Arrange the frozen tater tots in a single layer on top of the cheese.
7. Bake: Place the casserole in the preheated oven and bake for 30-35 minutes or until the tater tots are golden brown and crispy.
8. Serve: Once baked, let it cool for a few minutes before serving. This will help everything set and make serving easier.

By following these steps, you will create an incredible Cheesy Tater Tot Casserole that is sure to impress!