**INSTRUCTIONS**
1. Preheat the oven to 350ºF. Using a stand mixer or hand-held mixer, cream the butter with the lemon zest and the 1 cup minus 1 tablespoon of sugar until light and fluffy.
2. Add the egg and vanilla and beat until combined. Meanwhile, toss the blueberries with ¼ cup of flour, then whisk together the remaining flour, baking powder and salt.
3. Add half of the flour mixture to the batter and stir with spatula to incorporate. Add all of the buttermilk. Stir. Add the remaining flour and stir until the flour is absorbed. Fold in the blueberries. (Leave excess flour from the blueberry bowl behind.)
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