How to Make It
Heat oven to 425° F. Sprinkle a rimmed baking sheet with cornmeal.
Heat the oil in a large skillet over medium-high heat. Add the beef and cook, breaking it up with a spoon, until no longer pink, 3 to 4 minutes.
Meanwhile, shape the pizza dough into a large oval and place on the baking sheet.
Top the dough with the beef, broccoli rabe, onion, mozzarella, and ¼ teaspoon each salt and pepper. Bake until golden brown and crisp, 20 to 25 minutes.