The last time I served this casserole recipe, guests devoured it so fast

-1 lb. ground beef
-1/2 head of cabbage, chopped
-1/2 onion, diced
-1/2 teaspoon garlic powder
-1/2 teaspoon salt
-1/4 teaspoon pepper
-1 can (10.75 oz) cream of mushroom soup
-1/2 cup milk
-2 cups shredded cheddar cheese
-1 package (2 crusts) refrigerated pie crust