01 -
Preheat oven to 350°F (175°C) and line an 8x8 inch baking pan with parchment paper.
02 -
In a large bowl, whisk together flour, granulated sugar, and salt. Cut in the cold butter until the mixture is crumbly. Stir in vanilla extract.
03 -
Press two-thirds of the mixture into the bottom of the prepared pan and bake for 12-15 minutes until lightly golden.
04 -
In a saucepan, combine rhubarb, strawberries, brown sugar, cornstarch, and lemon juice. Cook over medium heat until the mixture thickens and the fruit softens.
05 -
Spread the strawberry rhubarb filling over the baked crust. Mix rolled oats into the remaining crumb mixture, then sprinkle over the fruit filling.
06 -
Bake for 25-30 minutes until the top is golden and set. Cool completely before cutting into bars.