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Export 7 ingredients for grocery delivery
Step 1
Preheat oven to 350 degrees F (175 degrees C). Grease an 8-inch square baking dish.
Step 2
Mix rhubarb, 1 tablespoon flour, sugar, water, cinnamon, and allspice together in a bowl. Mix oats, brown sugar, and 1/2 cup flour together in a separate bowl; add butter and mash into the oats mixture with a pastry cutter until crumbly.
Step 3
Press about half the oats mixture into the bottom of the prepared baking dish. Spread rhubarb mixture over the oats mixture; top with remaining oats mixture.
Step 4
Bake in preheated oven until rhubarb layer is set, about 45 minutes.