Caramel Chess Tassies

Ingredients

• 1 1/2 (15-ounce) package refrigerated piecrusts
• 1/2 cup butter, softened
• 1 1/2 cups firmly packed light brown sugar
• 3 large eggs
• 1 tablespoon all-purpose flour
• 1/4 cup buttermilk
• 2 teaspoons vanilla extract
• Powdered sugar (optional)
• Whipped cream