My guests can’t get enough of this dish at dinner parties.

1 lb ground beef
1 onion, diced
4 cups potatoes, peeled and thinly sliced
2 tablespoons butter
2 tablespoons all-purpose flour
2 cups milk
2 cups shredded cheddar cheese
Salt and pepper to taste
1 teaspoon garlic powder
1 teaspoon dried thyme