In a large bowl, combine milk, egg, melted butter, flour, powdered sugar, baking powder and cinnamon, if using. Use a fork to stir until well combined (lumps are not necessary; batter should be thick and smooth). Gently fold in the pie chunks.
Heata lightly greased pan over medium heat for at least two minutes before cooking.Pour batter into pan 1/4 cup or less at a time. Batter should be extremely thick and hard to pour; they should cook about 2-3 minutes on each side.
Place finished pancakes in a 200 F oven to keep warm if not eating right away.