Combine milk, eggs, melted butter, flour, cocoa powder, brown sugar, baking powder, salt, and vanilla extract in a blender. Puree for 1 minute or until smooth. Let sit for 30 minutes.
Melt 3 tablespoons butter in a cast iron pan over medium heat. Combine 4 tablespoons sugar with cinnamon and nutmeg and sprinkle on top of butter. Arrange pears on top. Sprinkle remaining 2 tablespoons sugar on top and bring to a simmer over medium heat.
Remove from heat and slowly pour pancake batter evenly on top. Bake chocolate German pear pancake for 15 minutes. Reduce oven temperature to 375 degrees F and continue to bake for another 10 minutes. Remove from oven and serve warm with whipped cream if desired.
Notes
You can make the pancake batter ahead of time and let it sit in the refridgerator until ready to use.