hamburger casserole recipe

Ingredients: 1 pound ground beef 1 onion, chopped 2 cloves garlic, minced 1 can (10.5 ounces) cream of mushroom soup 1 can (14.5 ounces) diced tomatoes, undrained 1 cup frozen mixed vegetables (peas, carrots, corn, etc.) 1 cup shredded cheddar cheese 1/2 cup sour cream 1 teaspoon Italian seasoning Salt and pepper, to taste