Beat eggs lightly in med bowl with wire whisk or hand beater. Beat in flour, milk, and salt just until mixed.
Melt butter in 9 inch pie plate (use a pyrex to maximize puffiness) in oven. Brush around pie plate to distribute evenly.
Sprinkle brown sugar and ground cinnamon evenly over the melted butter. Arrange sliced apples over the sugar. Pour batter over apple. Bake 30-35 minutes. Quickly loosen the edge of pancake and turn upside down onto a serving plate.
Serve with powdered sugar and lemon juice on the side.