In a mixing bowl whisk together the flour, baking powder, sugar and salt. Whisk in the half and half and egg until it reaches a pancake batter consistency. Add more flour or half and half as needed.
In a small mixing bowl, combine the raspberry preserves and adobo sauce and mix until smooth. Cover and place in the fridge until ready to serve.
In a large cast iron skillet over medium low heat melt the butter. Add the bread and lightly toast. Place 1 slice of Swiss cheese on one piece of toast, then place one slice of the pepper jack on the other piece. Remove from the skillet.
Assemble the sandwiches with the mayonnaise, mustard, turkey, ham and the remaining cheese slices. Mash slightly.
In a deep cast iron skillet add about 1 3/4 inches of oil and preheat to 350 degrees F.
With a serrated knife, cut the crust off of the bread and discard. With a pair of tongs, dunk the entire sandwich into the batter, making sure to generously coat on all sides. Allow the batter to drain slightly off the bread.
Place the sandwich in the hot oil and let it fry about 1 to 2 minutes. Carefully flip and fry the other side for about 2 minutes or until the crust is golden brown. Remove from the skillet and place on a wire rack to cool slightly.
Dust with powdered sugar and serve with the jam mixture for dipping.