Bake 20 to 25 minutes or until toothpick inserted in center comes out clean. Cool 5 minutes. Meanwhile, in medium microwavable bowl, microwave 3/4 cup butter on High until melted. In small bowl, mix 3/4 cup sugar and the pumpkin pie spice. Remove muffins from pan. Roll in melted butter, then in sugar mixture. Drizzle with caramel topping. Serve warm.