This Rhubarb Crumble Slice is a delicious, easy recipe to try at home. With a buttery oat base, tangy rhubarb filling, and crisp crumble topping, it’s the perfect slice to enjoy with a cup of tea or pack into lunchboxes. Simple to make and full of flavour, it’s a great way to use fresh rhubarb from the garden or a bunch from the market.

Ingredients
 

Base:

• 125g butter, melted
• 1 cup brown sugar
• 1 cup plain flour
• 1 tsp baking powder
• 1/2 cup rolled oats

Filling:

• 3 cups chopped rhubarb
• 1/2 cup sugar
• 1 tbsp cornflour
• 1 tsp vanilla essence

Crumble topping:

• 1/2 cup rolled oats
• 1/4 cup brown sugar
• 50g butter, cubed

Method

1. Preheat oven to 180°C and line a 20x30cm baking tray with baking paper.
2. Combine the base ingredients - melted butter, brown sugar, plain flour, baking powder, and oats until crumbly. Press into the tray and bake for 10-12 minutes.
3. In a saucepan over medium heat, combine rhubarb, sugar, cornflour, and vanilla essence.
4. Cook for 5–7 minutes until slightly softened. Spread evenly over the base.
5. Rub the cubed butter into the oats and brown sugar until the mixture resembles coarse crumbs and sprinkle over the rhubarb.
6. Bake for 25–30 minutes until golden and crisp.
7. Cool completely before cutting into slices.
8. Enjoy!