4 cups flour, plus more for dusting

1/2 cup sugar

2 teaspoons baking powder

1/2 teaspoon baking soda

1/2 teaspoon salt

1 teaspoon ground cinnamon

12 ounces cold butter, cubed

1 1/4 cups diced Granny Smith apples

1 1/4 cups buttermilk

3/4 cup peanut butter (crunchy or creamy -- your choice!)

1 1/2 cups confectioners' sugar

1/2 cup honey

About 1 tablespoon hot water

1 teaspoon vanilla extract