01 -
Preheat the oven to 375°F (190°C) and line a baking sheet with parchment paper.
02 -
In a food processor, pulse the flour, sugar, baking powder, and salt until combined.
03 -
Add cold butter and pulse 20 to 25 times until the mixture resembles coarse crumbs.
04 -
Transfer the mixture to a large bowl. Stir in buttermilk and vanilla extract until a dough begins to form. Add a splash more liquid if too dry.
05 -
Gently fold in the chopped rhubarb.
06 -
Turn dough onto a floured surface, knead briefly, and shape into a rectangle. Cut into rounds with a 3-inch biscuit cutter or slice into squares.
07 -
Place scones 2 inches apart on the baking sheet. Bake for 18 to 22 minutes or until lightly golden on top. Remove and let cool slightly before serving.