Lemon Blueberry Bars: You can add some lemon zest or a small amount ... Don’t pack the crunchy oatmeal crumble topping down. You want it to act like a crumble topping. Fresh fruit works best for this ...

You just want it to cool a bit before layering it into the crumble bars. Add the oats ... Set aside about 1 cup worth of the mixture for topping. Place the remainder into the prepared tin.

Sprinkle the topping over the filling. Bake until the topping is golden brown and the filling is bubbling, 45 to 50 minutes.

Place all crumble ... blueberry mixture onto the bottom layer. Sprinkle the remaining oat/walnut mixture onto the top of the blueberries. Bake 40-50 minutes, until blueberries start to burst and ...