Preheat the oven to 350°F and butter a 9 X 9 baking dish.
In a large bowl, stir together the melted butter and sugars. Beat in the eggs one at a time. Then stir in the vanilla.
In another bowl whisk together flour, baking powder, salt, and cinnamon.
Gradually add the flour mixture to the wet ingretients. Then stir in the apples, peanut butter chips, and pecans.
Spread the batter into the prepared pan (the batter will be THICK).
Bake for 35 - 40 minutes, and then cool completely before cutting into squares.
Notes
I prefer a firm, more tart apple to balance the sweetness - Granny Smith, Pink Lady, Honey Crisp, etc. Also, when I chop the apples for these bars I usually slice them thinly (like for a pie) and then cut up the slices into rough 1" pieces.
Recipe by Sugar Dish Me at https://www.sugardishme.com/chewy-apple-peanut-butter-bars/