In a saucepan, melt 2 TBSP butter, stir in brown sugar. Spread onto an ungreased 8 inch baking dish. Arrange blueberries in a single layer over brown sugar mixture, set aside.
In a large mixing bowl, cream remaining butter, beat in sugar. Add egg and vanilla, mix well. Combine flour and baking powder, add to creamed mixture alternately with milk Carefully pour over blueberries.
Bake at 350 for 40-45 minutes or until toothpick comes our clean. Immediately invert onto a platter. Cool.
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