– Add other fruit. You can substitute 1/2 to 1 cup of the peaches with other fruit. Blueberries, blackberries and strawberries are great additions to this peach crumble dessert.– Make it gluten free. Substitute the all purpose flour for 1:1 gluten free all purpose flour.– Add oats for more texture. You can add 1/4 cup of oats to the crumble to make an oat crumble topping.– Prep Ahead: You can also prep this dessert ahead and reheat it just prior to serving. It reheats in the oven well and tastes great for up to 3 days.