1 Tbsp. unsalted butter, room temperature, for greasing
1 1⁄4 cups whole milk
¼ cup plus 2 Tbsp. granulated sugar
2 Tbsp. kirsch, or substitute Cognac
1 Tbsp. pure vanilla extract
6 large eggs
¾ cup (3½ oz.) all-purpose flour
3 cups (1½ lb.) sweet red or black cherries, stemmed and unpitted (or substitute pitted)
Confectioners’ sugar, for dusting
Set a rack in the center of the oven and preheat to 425°F. Grease a 9-inch cast-iron skillet or baking dish with butter and set aside.
In a blender, add the milk, granulated sugar, kirsch, vanilla, eggs, and salt. Blend for a few seconds to mix, then add the flour and blend until completely smooth, about 1 minute. Pour the batter into the prepared skillet, then distribute the cherries evenly over the top.
Bake until a skewer inserted into the center comes out clean and a golden brown crust has formed on the top and bottom of the clafoutis, 35–40 minutes. Let the clafoutis cool to room temperature in the skillet. Dust with confectioners’ sugar, cut into wedges, and serve.