Caramelized Broccoli And Red Onion Pizza

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Ingredients

1 small head broccoli, cut into 1/2-inch florets (about 3 cups florets total)
1 small red onion, thinly sliced
1/2 teaspoon red pepper flakes
extra-virgin olive oil
kosher salt
1 recipe pizza sauce, such as our new york style pizza sauce
1 recipe new york style pizza dough, divided into three balls, or three 12-ounce balls store-bought pizza dough
1 pound grated full-fat dry mozzarella cheese (about 4 cups), very cold