4 eggs
2 cups milk
1/2 cup all-purpose flour
1 tablespoon ground cinnamon
1 cup sifted confectioners' sugar, divided
1/2 teaspoon salt
2 cups fresh or frozen blueberries
2 tablespoons butter

Preheat oven to 375 degrees F. Liberally grease a large cast iron skillet or 12-inch fluted flan dish.

In a large bowl, beat the eggs and milk together, then gradually stir in the flour, cinnamon, 3/4 cup of the confectioners' sugar and the salt. Beat until smooth. Gently fold in the blueberries.

Generously butter a large, heavy skillet or 12-inch fluted flan dish.

Bake until golden brown and set, about 45 minutes.

Let cool and sprinkle with the remaining 1/4 cup confectioners' sugar to serve.