Melt the butter. Place all ingredients in a blender and blend on high until a smooth batter forms.
Wait 5 minutes for the batter to thicken.
Lightly grease a skillet with butter and wipe off extra grease with a paper towel. Heat the skillet over low heat. Pour the thickened batter into small circles (about 1/3 cup each). Cook the pancakes until the bubbles pop on the top and the bottoms are golden: low and slow is the key! Then flip them and cook until golden on the other side.
Add 1 tablespoon milk to the remaining batter and stir so that it is pourable. Cook the remaining batter, adjusting the heat as necessary (the skillet can get very hot on the second batch). Place the cooked pancakes under an inverted bowl to keep them warm. Serve immediately with maple syrup.