May 14, 2023 4:39PM CDT
- 3 cups diced fresh rhubarb
- ½ cup white sugar
- 1 tablespoon all-purpose flour
- 1 tablespoon water
- 1 teaspoon ground cinnamon
- 1 teaspoon ground allspice (Optional)
- 1 cup rolled oats
- 1 cup brown sugar (packed)
- ½ cup all-purpose flour
- ½ cup butter
Gather all ingredients.
Preheat the oven to 350 degrees F (175 degrees C). Grease an 8-inch square baking dish.
Mix together rhubarb, sugar, flour, water, cinnamon, and allspice in a large bowl until combined. Set aside.
Make topping: Mix together oats, brown sugar, and flour in another large bowl. Use a pastry cutter to incorporate butter into oat mixture until crumbly.
Press about 1/2 of the oat topping into the bottom of the prepared baking dish.
Top with rhubarb mixture; cover with remaining topping.
Bake in the preheated oven until filling is set and top is lightly browned, about 45 minutes.