1. Mix together the all-purpose flour, baking powder, and salt.
2. In another bowl, combine the eggs, vanilla, sugar, brown sugar and butter to obtain a slightly foamy texture.
3. Mix the dry ingredients with the liquid ingredients.
4. Add the milk and mix until smooth.
5. Pour into a greased and floured 8 x 8 pan.
6. Bake for 1 hour at 350F.
7. The cake can be unmolded while still warm.