1. In a large bowl, blend eggs, flour, baking powder, sugar and salt. Gradually mix in milk, stirring constantly. Add vanilla, melted butter and 1/2 teaspoon nutmeg. Let batter stand for 30 minutes or overnight.
2. Preheat oven to 425 degrees F (220 degrees C).
3. Melt butter in a 10 inch oven proof skillet, brushing butter up on the sides of the pan. In a small bowl, combine 1/4 cup sugar, cinnamon and 1/2 teaspoon nutmeg. Sprinkle mixture over the butter. Line the pan with apple slices. Sprinkle remaining sugar over apples. Place pan over medium-high heat until the mixture bubbles, then gently pour the batter mixture over the apples.
4. Bake in preheated oven for 15 minutes. Reduce heat to 375 degrees F (190 degrees C) and bake for 10 minutes. Slide pancake onto serving platter and cut into wedges.
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