- 5 cups chopped rhubarb
- 1 cup chopped peach
- 1 1/2 cups white sugar, or to taste
- 1/4 cup all-purpose flour
- 1 cup brown sugar
- 1 cup quick oats
- 1 1/2 cups all-purpose flour
- 3/4 cup butter
- Preheat an oven to 375 degrees F (190 degrees C). Lightly grease a 9×13-inch baking dish.
- Mix the rhubarb, peach, white sugar, and 1/4 cup flour together in a large bowl until evenly combined; pour into the prepared baking dish and spread into an even layer.
- Stir the brown sugar, quick oats, and 1 1/2 cups flour together in a separate bowl. Cut the butter into the flour mixture with a knife or pastry blender until the mixture resembles coarse crumbs; sprinkle evenly over the rhubarb and peach mixture.
- Bake in the preheated oven until golden brown on top, about 45 minutes.