1. 1. Preheat the Oven: Set your oven to 450°F and line a baking sheet with parchment paper.

2. 2. Mix the Dry Ingredients: In a large bowl, whisk together the flour, baking powder, sugar, and salt.

3. 3. Cut in the Butter: Grate or cube the cold butter and cut it into the flour mixture using a pastry cutter or fork until it resembles coarse crumbs.

4. 4. Add the Milk: Pour in the cold milk and gently stir until the dough just comes together. Avoid overmixing.

5. 5. Fold in the Blueberries: Carefully fold the blueberries into the dough, being gentle to prevent them from bursting.

6. 6. Shape the Biscuits: Turn the dough out onto a floured surface and pat it into a 1-inch thick rectangle. Cut into rounds or squares with a biscuit cutter or knife.

7. 7. Bake to Perfection: Place the biscuits on the prepared baking sheet and bake for 12-15 minutes, until golden brown on top.

8. 8. Make the Glaze: While the biscuits are baking, whisk together the powdered sugar, water, vanilla, and lemon juice until smooth.

9. 9. Glaze and Serve: Remove the biscuits from the oven, let them cool slightly, then drizzle the glaze over the top before serving warm.