Mexican Lasagna Casserole

Ingredients:

1 pound ground beef

1 medium yellow onion, diced

2 teaspoons minced garlic

1/4 cup taco seasoning (2 packets)

1 (15 ounce) can black beans, rinsed and drained

1 (14.5 ounce) can diced tomatoes, undrained

1 cup water

12 corn tortillas (6-inch)

2 cups shredded Monterey Jack cheese

1 cup sour cream