City Eatery Upside Down Blueberry Cake

Source: City Eatery - New York, New York

1/2 pint blueberries
8 ounces all-purpose flour
1/3 cup granulated sugar
1/2 cup milk
Brown sugar
2 eggs
1/4 cup (1/2 stick) softened butter

Preheat oven to 350 degrees F.

Cream the butter and sugar; add eggs. Incorporate milk; add flour, then mix until smooth.

Lay out four 6-inch round rings on a parchment lined baking sheet. Divide the blueberries evenly among them. Fill each with batter. Bake for 15 to 20 minutes.