The first impossible pies were created in the 1960s by the bisquick baking team. The quiche-like pies magically form a crust as they bake, which makes them a great choice for quick and easy lunches and dinners. Impossible pie recipes ranged from the sweet coconut pie, brownie pie, and buttermilk pie to savory lasagna pie, seafood pie, and cheeseburger pie. Most impossible pies include the basic bisquick, egg, and milk mixture. This version is a hearty main dish pie with ground beef, cheese, and tex-mex seasonings. Feel free to change it up a bit to suit your taste. Add about 1 cup of sliced sauteed mushrooms along with the ground beef. If you crave heat, add a minced jalapeno pepper or a dash of ground cayenne. If you like cilantro, sprinkle a few layers of chopped cilantro over the beef layer. For a lighter entree, use ground turkey instead of beef. Make this pie an extra-special creation with garnishes. Offer small bowls of sour cream, guacamole, diced onions, sliced scallions, purchased or homemade salsa, and sliced black olives. For a hearty dinner, add a tossed salad and a crusty baguette or rolls.