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1- Preheat the oven to 350ºF. Cream butter with lemon zest and a ⅞ cup of the 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 the flour mixture to the batter a little at a time, alternating with the buttermilk. Fold in the blueberries.
4- Grease a 9-inch square baking pan (or something similar) with butter or coat with non-stick spray. Spread batter into the pan. Sprinkle batter with remaining tablespoon of sugar. Bake for 35 to 45 minutes. Check with a toothpick for doneness. If necessary, return pan to oven for a couple of more minutes. (Note: Baking for as long as 10 minutes more might be necessary.) Let cool at least 15 minutes before serving.
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