In a medium bowl, whisk together the flour, baking powder, salt, cinnamon, and sugar.
Add the milk, egg, and melted butter to the dry ingredients and mix until just combined.
Fold in the diced apples.
Heat a large skillet over medium-high heat and spray with cooking spray.
Drop 1/4 cup of the batter onto the hot skillet and cook until golden brown, about 2 minutes per side.
Remove the pancakes from the skillet and repeat with the remaining batter.
Top the pancakes with caramel sauce and serve with a sprinkle of cinnamon.