- Preheat the oven to 400°F.

- In a large skillet, cook ground beef and onion until the beef is browned and the onion is softened. Drain any excess grease.

- Spread the beef and onion mixture evenly in a greased 9-inch pie pan.

- Sprinkle cheese over the meat.

- In a medium bowl, whisk together milk, onion soup mix, Bisquick, and eggs until well combined.

- Pour the mixture into the pie plate over the meat.

- Bake for 25 minutes.

- Allow the dish to cool for a few minutes before serving.