Grandma Nash's Apple Squares

Grandma Nash's Apple Squares
1 cup sifted flour
1 tsp baking powder
¼ tsp salt
¼ tsp cinnamon
¼ cup butter
½ cup packed brown sugar
½ cup sugar
1 egg
1 tsp vanilla
½ cup chopped apple
½ cup finely chopped walnuts
1 Tbsp Cinnamon sugar (mix ½ cup gran. Sugar with 1 ½ tsp cinnamon) There will be a lot extra of this, I just saved it and kept it for my next batch
Combine flour, baking powder, salt & cinnamon
Melt butter, beat in sugars, egg & vanilla until smooth
Stir in flour mixture, apple & walnuts until thoroughly combined
Spread into greased 8x8x2 in pan
Sprinkle with 1 Tbsp cinnamon sugar mix
Bake at 350 degrees for 20 min, or until top springs back when pressed with fingertip. Inside will by slightly gooey, moist.
Cool completely, cut into squares.