Peaches 'n' Cream Bars

all-purpose flour (spoon & leveled)

old fashioned rolled oats (or quick oats)

packed dark brown sugar (or light)

ground cinnamon

unsalted butter, cold and cubed

chopped pecans, optional

large egg

granulated sugar

all-purpose flour

salt

medium peaches, peeled and chopped (about 1.5 cups)

confectioners' sugar

heavy cream (or milk)

vanilla extract