Cowboy Casserole

Name: Cowboy Casserole
Ingredients: 2 cups frozen corn kernels; 1 medium yellow onion; 2 cloves garlic; 8 ounces sharp cheddar cheese, shredded (about 2 cups); 1 (about 15-ounce) can black beans; 2 tablespoons olive oil; 1 pound lean ground beef; 1 teaspoon kosher salt; 1/4 teaspoon freshly ground black pepper; 1 (1-ounce) packet taco seasoning mix; 1 (14.5-ounce) can fire-roasted diced tomatoes with juices; 1 cup sour cream; 32 ounces frozen tater tots