Preheat oven to 400°F (200°C).
In a large bowl, whisk together flour, sugar, baking powder, and salt.
Cut in the cold butter until the mixture resembles coarse crumbs.
In a separate bowl, whisk together heavy cream, egg, and vanilla extract.
Pour the wet ingredients into the dry ingredients and mix until just combined.
Fold in the sprinkles.
Turn the dough out onto a floured surface and shape into a circle about 1-inch thick.
Cut into 8 wedges and place on a baking sheet lined with parchment paper.
Bake for 18-20 minutes, or until golden brown.
Let cool on a wire rack before serving.