Preheat oven to 425 degrees
Melt butter in a cast iron skillet in the preheated oven
While the butter is melting add remaining ingredients to a blender and blend until smooth, scraping down the sides of the blender when needed
Right over the melted butter, pour the batter into the hot skillet. Put the hot pan back into the oven and bake for 20 minutes
After 20 minutes, lower the temperature to 300 degrees and bake for five more minutes
The dutch baby will be puffed and golden brown. After five minutes, remove the dutch baby from the oven, slice, and serve immediately
