First, I preheated the oven to 425°F (220°C) and lined a baking sheet with parchment paper. Getting the oven hot before you start ensures the biscuits rise properly.
In a large bowl, I whisked together the flour, baking powder, sugar, and salt. It’s important to make sure the dry ingredients are well-blended before adding anything else.
I grated frozen butter straight into the bowl and used a pastry cutter to mix it in. You can also use your fingers to rub the butter into the flour until it looks like coarse crumbs.
This part is delicate. I gently folded in fresh blueberries, making sure not to crush them. If you’re using dried berries, they’re even easier to mix in without bursting.
Next, I poured in the cold milk and stirred slowly until the dough just came together. It’s very important not to overmix—it keeps the biscuits light and fluffy.
I turned the dough out onto a floured surface, patted it down to about 1-inch thickness, and used a glass rim to cut out biscuit rounds.
I placed the biscuits on the baking sheet and baked them for 12–15 minutes until they were golden brown on top. The smell was irresistible!
While the biscuits baked, I whisked together the powdered sugar, water, vanilla, and lemon juice. Once the biscuits cooled just slightly, I drizzled that sweet lemon glaze all over. Delicious!