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Gather the ingredients. Preheat the oven to 425 F.
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Add the flour, sugar, baking powder, and salt to a large bowl and mix.
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Using the large side of a box grater, grate in the cold butter and then stir with your fingers to make sure it's coated in the flour mixture. Alternately, you can cut the butter into 1 inch pieces and work it in with your fingers, a fork, or a pastry cutter until the largest pieces are the size of peas.
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Pour in the milk and lemon zest and stir to roughly mix. Add the blueberries and mix just until barely incorporated.
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Turn the dough out onto well-floured surface and roll it out to about a 1-inch thickness.
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Using a 2 1/2-inch cookie or biscuit cutter, cut out the biscuit rounds and place them on a baking sheet lined with parchment paper.
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Bake for 15 to 20 minutes or until the biscuits are a light golden brown. Let cool slightly.
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To make the lemon glaze, whisk together the powdered sugar, milk ,and lemon juice until smooth.
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Pour over the slightly cooled biscuits and serve.