01 -
Preheat oven to 350°F (175°C).
02 -
In a medium bowl, combine flour and powdered sugar. Cut in the butter until the mixture resembles coarse crumbs.
03 -
Press crust mixture evenly into a greased 9×13-inch baking dish.
04 -
Bake the crust for 10 minutes and remove from the oven.
05 -
In another bowl, whisk together the granulated sugar, flour, and salt. Add eggs and whisk until smooth.
06 -
Stir in the diced rhubarb and pour the custard filling over the pre-baked crust.
07 -
Bake for an additional 35–40 minutes, or until the custard is set and the edges are lightly golden.
08 -
Let cool completely before slicing into bars. Dust with powdered sugar if desired.