2. Arrange pineapples around the bottom of the pan, filling each center with a cherry. Place cast iron pan in the fridge, until the batter is ready.
3. Whisk cake flour, baking powder, baking soda, and salt together.
4. Using a stand mixer, beat butter on high until smooth and creamy. Add sugar and beat until creamed.
5. On high speed beat in egg whites until well combined, then beat in sour cream and vanilla.
6. Pour dry ingredients into wet ingredients and mix at low speed. As the mixture blends, slowly add milk. Beat until ingredients are just combined.
7. Pour cake batter over topping and place inside your 350F or so smoker for about 45 minutes. If cake begins to brown more than we would like, tent the pan in foil while smoking. The cake is done, when a clean toothpick can be inserted and removes mostly clean.
8. Cool for about 20 minutes, before flipping out the cake and slicing.