Preheat the oven to 500°F.
Add the olive oil to a large sauté pan set over medium heat. Add the ground chicken, garlic powder, cumin, oregano, salt, pepper and lime juice and cook, breaking apart the chicken, until it is cooked throughout.
Lightly flour your work surface and roll the pizza dough until it reaches about 12 inches wide and 1/4-inch thick. Liberally cover a baking sheet (or pizza stone) with cornmeal then transfer the dough onto the baking sheet. Spread the refried beans on top of the dough, leaving a 1-inch border around the edges.
Alternately sprinkle the chicken and cheese on top of the beans then bake the pizza for 10 to 12 minutes until crust is fully baked and golden brown.
Remove the pizza from the oven and top it with the lettuce, tomatoes, onions and sour cream. Slice and serve immediately.