To a mixing bowl, sieve all-purpose flour, then add baking powder and salt. Mix until well combined. Grate the cold butter into a flour mixture, mix using a pastry blender or fork. Set aside.
Preheat oven to 400℉.
Cook onion with ground beef until the onion is translucent and the beef is browned.Add minced garlic, salt, and pepper, and cook again for about 3 minutes.
Spread beef mixture to a casserole, and topped it with cheddar cheese.
Whisk bisquick with milk and eggs until well combined. Pour the bisquick mixture evenly over the beef mixture and cheese, and bake for 30 minutes.
Sprinkle it with fresh parsley. Serve while still warm. Enjoy!