Step 1

Place a large cast-iron skillet in the oven; preheat to 500 degrees F.

Step 2

Form dough into a tight ball; place on a lightly floured work surface and cover with a clean towel. Let come to room temperature, about 15 minutes.

Step 3

Meanwhile, whisk mayonnaise, vinegar, sugar, garlic, horseradish and pepper in a small bowl.

Step 4

Roll the dough into a 14-inch circle. Carefully fit into the hot pan, pressing a little up the sides. Bake until slightly crispy, about 5 minutes.

Step 5

Spread tomato sauce over the crust and sprinkle with chicken, onion, mozzarella and Monterey Jack. Bake until the cheese is melted and bubbling and the crust is crispy on the bottom, about 5 minutes.

Step 6

Let the pizza cool for 3 minutes. Drizzle the reserved BBQ sauce on top and sprinkle with scallions. Cut into 4 slices and serve immediately.