Preheat oven to 375°F. Prepare pan cavities with vegetable pan spray.

In a medium bowl, combine flour, sugar, baking powder and salt; set aside. In large bowl, whisk together melted butter, milk, eggs, vanilla and orange zest. Add flour mixture; stir until just combined. Gently stir in raspberries. Divide evenly into prepared pan cavities.

Bake 20-23 minutes. Let cool in pan on cooling grid 5 minutes, then turn muffins out of pan. In small bowl, whisk together confectioners’ sugar and orange juice. Drizzle over muffins. Serve warm or at room temperature.