Ingredients
Equipment
Method
Step‑by‑Step Instructions
- Preheat your oven to 400°F (200°C) and grease a 9-inch square pan with butter or cooking spray.
- In a bowl, combine flour, sugar, and baking powder. Rub in the butter until coarse crumbs form, then mix in the egg until cohesive.
- Press the dough into the prepared pan evenly and bake for about 10 minutes until it begins to set.
- In a saucepan, combine diced rhubarb, sugar, lemon zest, and lemon juice. Cook on medium heat until bubbling and rhubarb softens (about 5 minutes).
- Reduce heat and stir in cornstarch, simmering for 3 to 5 minutes until thickened.
- Spread the thickened rhubarb filling evenly over the hot crust.
- Mix rolled oats, sugar, and melted butter until crumbly. Sprinkle over the rhubarb filling.
- Bake for 20 to 25 minutes until topping is golden brown and filling is bubbly.
- Cool completely in the pan for about 30 minutes before slicing into squares.
Nutrition
Notes
For best results, ensure the filling thickens properly and store the bars in an airtight container to maintain freshness.
