Pour melted butter, yogurt, water, flour, eggs, salt, parmesan cheese, spinach and basil into a blender. Blend on high until greens are fully incorporated a smooth batter remains.
Place 1 tbsp of butter in a 10 inch cast iron skillet. Place skillet in the oven until the butter melts about 3 minutes - be careful not to burn the butter.
Pour the batter into the warm skillet on top of the butter and bake at 450F for 22-24 minutes. The pancake will be bubbled up and puffy and deflate out of the oven.
As soon as it comes out of the oven place whatever toppings you want on top - I used prosciutto and goat cheese. Cut into slices and serve!