Caramel Sponge Pie

Directions

1. 1
   Preheat an oven to 350 degrees F (175 degrees C).
2. 2
   Separate egg whites from yolks, and place in separate large bowls. Use an electric mixer to beat egg whites until stiff.
3. 3
   To the yolks, add the brown sugar, butter, flour, and milk; beat well. Fold egg whites into the batter; pour into the pie crust.
4. 4
   Bake in the preheated oven until set and lightly browned, about 45 minutes.