Step 3: Cooking the pancake - part one
Preheat the oven to 350 degrees F.
Place the cast iron pan over medium heat, and melt the butter in the pan. Make sure to swirl it around to properly coat the entire pan.
Carefully lay the apple slices in the bottom of the pan in a circle - this is important because you want the top of the pancake to look good when flipped over later.
Sprinkle the apples with the brown sugar, cinnamon and nutmeg. Let them cook for 1-2 minutes, just enough to brown the bottom. You'll hear the apples sizzling.
Gently pour the prepared pancake batter over the apples, allowing it to spread to the edges of the pan. Let the pancake cook on the stove top for a few more minutes, until the brown sugar bubbles up through the batter, and little vents begin spewing steam. The pancake is now ready to go into the oven.