Mini Chicken and Broccoli Pot Pies

INGREDIENTS

• 1 cup broccoli florets, cut into 1/4 to 1/2-inch pieces, steamed (about 2 ounces)
• 2 tablespoons unsalted butter, at room temperature
• All-purpose flour, for dusting
• Special equipment: 12-cup mini-muffin pan; 3-inch round cookie cutter; 2-inch round cookie cutter
• 1 teaspoon kosher salt
• Vegetable oil cooking spray
• 1/4 teaspoon freshly ground black pepper
• 1/4 cup grated Parmesan
• 1 large egg
• 2 tablespoons all-purpose flour
• Two 10-inch round unfold-and-bake frozen pie crusts, thawed
• 3/4 cup whole milk, at room temperature
• 1 small store-bought rotisserie chicken breast, chopped into 1/4-inch pieces (about 3/4 cup meat)