It's dinner time!

Ingredients

• 2 cups water
• 1 cup uncooked rice
• 1 tablespoon butter
• 1 small onion, chopped
• 1 clove garlic, minced
• 1 pound ground beef
• 1 (8 ounce) can sliced mushrooms, drained
• salt and ground black pepper to taste
• 1 (15 ounce) can tomato sauce
• 4 slices Cheddar cheese