Preheat oven to 400°.
In a skillet, brown beef until no pink remains, then mix with taco seasoning.
In a bowl, mix together refried beans, taco sauce, and pizza sauce. Spread bean mixture onto crust. Top with mozzarella cheese, then ground beef, then colby jack.
Bake 10–15 minutes or until the cheese is melted.
Sprinkle with desired toppings and cut with a pizza cutter