Preheat the oven to 425 F. Line a baking sheet with parchment paper and set aside.
In a large bowl, whisk together the flour, sugar, baking powder, and salt. Set aside.
Cut in the butter using a pastry cutter or two knives until only pea sized pieces remain. Stir in the blueberries
Pour in the buttermilk and vanilla extract. Gently stir until the dough just comes together.
Pour the dough out onto a lightly floured surface. Roll out until it is 1.5-2” thick, then use a circle biscuit cutter to cut biscuits and transfer to the prepared baking sheet, making sure the biscuits are touching. Repeat the process with the scrap dough until all has been shaped into biscuits.
Brush the tops of the biscuits with heavy cream, then bake in the preheated oven for 18-22 minutes, or until the biscuits are golden brown and puffed up.
Allow to cool completely.