Preheat oven to 350°. Line 4-quart Dutch oven with parchment paper; lightly spray with cooking spray. Combine pie filling and evaporated milk; spread pie into bottom of Dutch oven. Sprinkle with cake mix (unprepared) and almonds; drizzle with butter. Bake, covered, until cake springs back when touched, 35-40 minutes. If desired, serve with ice cream.