Heat oven to 350 Butter a 1-quart souffl dish Pour 2 tablespoons melted butter into the souffl dish Sprinkle 3 tablespoons brown sugar over butter Scatter 1 cup blueberries over sugar Set aside
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 egg Whisk milk into the egg mixture Add flour mixture; whisk until batter is smooth
Pour half the batter into souffl 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 vanilla ice cream if desired
