Heat the oven to 425 degrees F.
Whisk the eggs and milk together in a medium bowl. Add the flour, salt, and sugar and whisk to blend. Melt 2 tablespoons of butter and whisk it into the batter.
In each cup of regular sized muffin tins, divide cold butter, apple and raisins. Place the muffin tins in the oven for 5 minutes to melt the butter and cook the apples slightly.
Remove the tins from the oven and pour the batter into each cup filling them half way up. Bake for 10 minutes, then reduce the heat to 375 degrees F and bake until puffed and golden brown, 15 to 20 minutes more. Serve hot.