Lightly butter the insides of six 1-cup ramekins, and coat the bottom and sides with granulated sugar (pour out an excess sugar). Put on a rimmed baking sheet. Toss the blueberries with 1/4 cup granulated sugar in a medium bowl and set aside.
For the batter:
Whisk the flour, cornmeal, granulated sugar, baking powder and salt in a medium bowl. Rub the butter and zest into the flour mixture with your fingers until the mixture is powdery. Stir in the milk with a rubber spatula until moist. Divide the batter among the prepared ramekins and top each with some of the blueberries.
Bake until the buckles puff and brown, 25 to 30 minutes. Cool for at least 20 minutes. Serve warm or at room temperature dusted with confectioners? sugar and topped with ice cream if using,
When measuring flour, we spoon it into a dry measuring cup and level off the excess. (Scooping directly from the bag compacts the flour, resulting in dry baked goods.)
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