Heat the oven to 350º F and lightly grease a 9×5-inch baking dish with butter or non-stick spray.
Put blueberries in 1/4 cup of flour until they are covered, then leave them to the side.
In a big bowl or with a mixer, mix butter, sugar, and lemon peel until fluffy and lighter in color, for about 3-5 minutes.
Mix the egg well, then add the vanilla extract.
In another bowl, mix the rest of the flour with baking powder, salt, and cinnamon, if desired.
Add the flour mixture and buttermilk to the batter, starting and finishing with the dry ingredients.Add the flour mixture and buttermilk to the batter, starting and finishing with the dry ingredients.
Mix blueberries covered in flour into the batter, and then pour the mixture into a greased baking dish. Sprinkle 1 tablespoon of sugar on top, then put the dish in the oven.
Bake for 40-50 minutes, or until a toothpick inserted in the center comes out clean.
Take out of the oven and place on a wire rack to cool down for at least 15 minutes.
Serve it warm or at room temperature and enjoy.
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