Tart, sweet, and buttery, these rhubarb crumb bars are a nostalgic treat straight from grandma's kitchen. Perfect for dessert - or even breakfast with a side of eggs and bacon.
Preheat oven to 350°F. Lightly grease a 9x13 baking dish.
Cook the filling: In a saucepan over medium heat, combine rhubarb, sugar, corn starch, water, and vanilla.Stir occasionally until thickened, about 8 minutes.Remove from heat.
Make the crumble: With a pastry cutter or a fork mix oatmeal, flour, brown sugar and butter together into a crumble
Press base: Pat 3/4 of the crumble mixture into the bottom of a 9x13 baking dish
Add Filling: Pour rhubarb mixture over the base and spread evenly.
Swirl jam (optional): Warm jam in the microwave and drizzle over rhubarb. Swirl with a knife.
Top with remaining crumble.
Bake for 30-35 minutes or until golden brown. Cool completely before slicing.
Notes
Frozen rhubarb works great - no need to thaw first.
Swap in raspberry or apricot jam for a different twist.
These freeze beautifully-wrap individual bars for a grab-and-go treat
Best enjoyed with coffee, serve it with ice cream or as part of a county breakfast alongside eggs and bacon!