Heat the oven to 375° F. Grease a 13x9x2-inch baking dish.
Cook and stir the ground beef in a large skillet
until browned; drain off the excess fat. Season the ground beef with the salt and
pepper; set aside. In a small bowl mix together the cheese, sour cream, mayonnaise and onion; set aside. Stir the biscuit mix and water together until a soft dough forms. With floured fingers, pat the dough into the prepared baking dish, pressing the dough about 1/2-inch up the sides of the pan. Layer the browned ground beef, tomato slices, green pepper, and sliced olives over the dough layer.
Spoon the sour cream and cheese mixture evenly over the top of the casserole. Bake, uncovered, until the edges of the dough are light brown, 25 to 30 minutes. Cool for about 5 minutes and then cut into squares to serve.
Calories per serving: 609
Fat per serving: 36.7g