Cheesy Broccoli Puffs

Name: Cheesy Broccoli Puffs
Ingredients: One 10.8-ounce bag frozen broccoli florets, such as Birds Eye® Steamfresh® Broccoli Florets; 1 1/2 cups shredded mozzarella (about 6 ounces); 1 cup crumbled feta (about 6 ounces); 1 cup part-skim ricotta; 1/4 cup fresh dill, chopped; 2 tablespoons chopped chives; 1/4 teaspoon crushed red pepper flakes; Zest of 1 lemon; Kosher salt and freshly ground black pepper; 1 large egg; 3 sheets frozen puff pastry (from one-and-a-half 17.3-ounce packages), thawed; All-purpose flour, for dusting, optional; 1 tablespoon sesame seeds