01 -
Preheat the oven to 400 degrees Fahrenheit (200 degrees Celsius). Line a baking sheet with parchment paper. In a large bowl, whisk together the flour, granulated sugar, brown sugar, baking powder, cinnamon, and salt.
02 -
Add the cold butter cubes to the flour mixture. Use your fingertips or a pastry cutter to rub the butter in until the mixture resembles coarse crumbs with no pieces larger than a pea.
03 -
In a small bowl, whisk the milk, egg, and vanilla extract. Pour over the dry ingredients and stir with a fork just until the dough comes together. Do not overmix.
04 -
Gently fold in the diced rhubarb until evenly distributed throughout the thick batter.
05 -
Drop heaping quarter-cup mounds of batter onto the prepared baking sheet, spacing them about 2 inches apart. Bake for 11 to 13 minutes, or until the bottoms are golden brown and the centers feel set.
06 -
Whisk the confectioners sugar, milk, and vanilla into a thin glaze. Brush a thin layer over the warm fritters. Place under the broiler for 2 to 4 minutes until the glaze bubbles and turns golden in spots.
07 -
Stir the remaining 1/2 teaspoon of milk into the leftover glaze to loosen it, then brush over the warm fritters. Let cool until the glaze hardens before serving.