01 - 
                Preheat the oven to 400°F. Grease a medium glass pie plate (9-inch) with vegetable oil.
              
              
              
                02 - 
                In a large skillet, heat some oil over medium heat and fry the onion until soft, about 3 minutes.
              
              
              
                03 - 
                Add the ground beef to the skillet, breaking it apart with a spatula. Cook until browned, about 10 minutes. Drain any excess fat from the beef and season with salt, black pepper, and optionally, garlic powder.
              
              
              
                04 - 
                Spread the cooked and seasoned beef mixture evenly into the prepared pie plate. Sprinkle the cheddar cheese over the beef layer.
              
              
              
                05 - 
                In a small bowl, whisk together the Bisquick mix (or flour), milk, and eggs until combined. Pour this batter over the beef and cheese layers in the pie plate.
              
              
              
                06 - 
                Bake for 20 to 25 minutes, or until a knife inserted in the center comes out clean.
              
              
              
                07 - 
                Serve warm and enjoy this comforting slice of cheeseburger pie.