Preheat oven to 350°. Mix pie filling and almond extract; spread into a greased 11x7-in. baking dish. Stir together blueberries and brown sugar; place over pie filling. Sprinkle with cake mix; drizzle with butter., Bake until golden brown, 30-35 minutes. Cool on a wire rack. If desired, serve with whipped cream and additional blueberries.