1. Prepare the Meat Patties

• Preheat oven to 375°F (190°C).

• In a mixing bowl, combine ground beef with garlic powder, onion powder, salt, and pepper.

• Form the mixture into 6 hamburger patties.

• In a large skillet over medium heat, brown the patties for 2–3 minutes per side. Do not fully cook through. Remove and set aside.

2. Make the Gravy

• In the same skillet (with drippings), whisk together 1 cup of milk and flour until smooth.

• Gradually whisk in the remaining 1 cup milk.

• Cook, stirring constantly, until the mixture thickens into a creamy gravy.

• Season with additional salt and pepper to taste.

3. Assemble the Casserole

• Grease a 9×13-inch baking dish.

• Layer half of the potato slices in the bottom of the dish.

• Add half of the onion slices over the potatoes.

• Place the browned patties evenly over the onions.

• Top with the remaining potatoes and onions.

• Pour the prepared gravy evenly over the entire dish.

4. Bake the Dish

• Cover tightly with foil and bake for 1 hour.

• Remove the foil, sprinkle shredded cheddar cheese evenly over the top, and bake uncovered for 15 minutes until the cheese is melted and golden.

• Let rest for 5–10 minutes before serving.