Beef and Potato Casserole

Name: Beef and Potato Casserole
Prep time: 20 min
Cook time: 1 h 15 min
Total time: 1 h 35 min
Cuisine: American
Ingredients: 1 pound ground beef (hamburger); 2 cloves garlic (minced); 2 large russet potatoes (peeled and sliced thin (about 3-4 cups)); 10.75 ounce can cream of mushroom soup (condensed); 1 yellow onion (chopped (about ½ cup)); ¾ cup milk; 2 cups shredded sharp cheddar cheese (divided)