Add the butter, white sugar and brown ale to a saucepan over high heat. Stir until butter is melted and sugar is dissolved. Allow to boil without stirring until dark amber color, about 5 minutes. Remove from heat, stir in the cream, allow to cool until the bubbling stops.
Arrange the apples slices in a cake pan or deep dish pie pan that has been well greased.
Pour the caramel over the apples.
Ina large bowl stir together the flour, cinnamon, nutmeg, baking powder, salt, white sugar and brown sugar.
Make a well in the dry ingredients, add the eggs, beer, cream, melted butter and vanilla, stir until just incorporated.
Pour batter over apples.
Bake at 325 for 45 minutes or until golden brown and top springs lightly when touched.
Wait precisely ten minutes, invert on a serving plate to remove from pan.