White Linen Cupcakes

INGREDIENTS

• 1/2 cup butter, softened
• 1 cup shortening
• 2 cups sugar
• 4 large eggs
• 2 3/4 cups all-purpose soft-wheat flour
• 2 teaspoons baking powder
• 1/2 teaspoon salt
• 1 cup buttermilk
• 1 to 2 tablespoon vanilla bean paste
• Paper baking cups
• Vegetable cooking spray
• 1 cup whipping cream
• 12 ounces mascarpone cheese, softened
• 1 cup powdered sugar
• 1 teaspoon vanilla extract
• 1/8 teaspoon salt
• White chocolate curls