Berry-Orange Fruity Oaty Bars

chopped almonds , walnuts , pecans , or hazelnuts , plus more for sprinkling on top if you want*

rolled oats , divided*

whole-wheat pastry flour (or run regular whole wheat flour through a sifter a couple of times)

all-purpose flour

sugar

salt

cold unsalted butter , cut into small pieces

large egg

canola oil

vanilla

almond extract

cranberries , blueberries , raspberries , cherries or strawberries , fresh or frozen, divided

orange juice

– 1 cup** sugar

cornstarch

orange segments

grated orange zest

vanilla