Spray the bottom of an 8" round cake pan with cooking spray. In a small bowl, mix together the butter and brown sugar. Spread this mixture in the bottom of the prepared pan. Arrange the pineapple and maraschino cherries on top. Set aside.
In a medium size bowl, beat the egg yolks and sugar thoroughly, about 3 minutes by hand. Add the boiling water and lemon flavoring. Mix for about 1 minute. In a separate bowl, sift together the flour, baking powder and salt. Add this to the wet ingredients and mix until combined, about 30 seconds. Pour this batter over the pineapple, spreading the batter out evenly. Bake for about 35 minutes or until the cake springs back when you touch the center with your finger.
Allow the cake to cool for 5 minutes, then turn the cake upside down on a plate to serve it. If the cake has a dome on it, cut the dome off before turning the cake out so it sits evenly. Sprinkle the top with powdered sugar, if desired.