Preheat your oven to 425°F.
Prepare a baking sheet by lining it with parchment paper.
Combine flour, baking powder, sugar, and salt in a large bowl.
Toss blueberries into the mixture and set aside.
Grate cold butter into the flour mixture.
Use your fingertips or a pastry cutter to mix until it resembles coarse crumbs.
Slowly add buttermilk while stirring until a dough forms.
Avoid overworking; it's okay if the dough is slightly sticky.
Transfer the dough to a floured surface.
Gently knead and roll out to about an inch thick.
Cut biscuits using a round cutter and place onto the prepared baking sheet.
Bake for 12-15 minutes or until golden brown.
Combine powdered sugar and lemon juice to make glaze.
Drizzle over warm biscuits.