- 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.