Blueberry Upside Down Cake Recipe

4 tablespoons butter, melted, plus more for soufflé dish
1/3 cup plus 3 tablespoons light-brown sugar
1 1/2 cups blueberries, picked over and cleaned
3/4 cup cake flour (not self-rising)
1 teaspoon baking powder
1/4 teaspoon salt
1 large egg
1/4 cup milk, room temperature

1. Heat oven to 350 degrees. Butter a 1-quart, 5 1/2-inch-diameter soufflé dish. Pour 2 tablespoons melted butter into the soufflé dish. Sprinkle 3 tablespoons brown sugar over butter. Scatter 1 cup blueberries over sugar. Set aside.
2. In a medium bowl, whisk together flour, baking powder, and salt. In another medium bowl, whisk together remaining 2 tablespoons butter, remaining 1/3 cup brown sugar, and the egg. Whisk the milk into the egg mixture. Add flour mixture; whisk until batter is smooth.
3. Pour half the batter into soufflé dish. Sprinkle remaining 1/2 cup blueberries over batter. Spread remaining batter over blueberries. Bake until a cake tester inserted in the middle of the cake comes out clean of batter, about 45 minutes. Immediately unmold cake, inverting it onto a serving dish. Serve warm with whipped cream if desired.

Recipe modified from: marthastewart.com