In a skillet over medium-high heat, use a wood spoon or spatula to break up ground beef and cook for 7-10 minutes, or until browned.
Drain excess grease and mix in taco seasoning; set aside.
Place pizza crusts on a baking sheet lined with foil and bake for 3 minutes, then remove from the oven.
Spread equal amounts refried beans on each pizza crust.
Top each pizza with equal parts of cooked ground beef, cheddar cheese, diced tomato, and diced onion.
Place back in the oven for 10 minutes, or until the cheese is melted and edges are golden brown.
Remove from oven and top each pizza with cilantro and avocado.
Whisk together salsa and sour cream and drizzle on top of the cooked pizza.
Cut into slices and serve.
Notes
I love using pre-made flatbread pizza crusts when I'm short on time or don't want to worry about making homemade pizza dough. Most flatbread pizza crusts come in packs of 4 so you can make a few small pizzas or use a larger pizza crust and make 1 or 2 larger pizzas. Just be sure to divide ingredients equally between each pizza.