Poor Man Husband Casserole

1 lb. ground beef or turkey

1 onion, chopped

1–2 cloves garlic, minced

1 can (10.75 oz.) cream of mushroom soup

1 cup sour cream or Greek yogurt

1 package (16 oz.) frozen mixed vegetables (like peas, carrots, green beans, etc.)

1 bag (16 oz.) frozen tater tots

1–2 cups shredded cheddar cheese

Salt and pepper, to taste

Optional seasonings: dried basil, oregano, or thyme