01 - 
                Preheat your oven to 400°F (200°C). Lightly grease a 9-inch glass pie plate with vegetable oil.
              
              
              
                02 - 
                In a large skillet over medium heat, heat a small amount of oil. Add the chopped onion and sauté until softened, 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, then season with salt, black pepper, and garlic powder if using.
              
              
              
                04 - 
                Spread the cooked beef mixture evenly in 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 smooth. Pour the batter evenly over the beef and cheese layers.
              
              
              
                06 - 
                Bake for 20-25 minutes, or until a knife inserted in the center comes out clean.
              
              
              
                07 - 
                Let the pie cool slightly before slicing. Serve warm and enjoy!