Melt butter and let cool slightly. Put all ingredients into a blender and blend until smooth.
Heat a nonstick pan over medium heat. Add 1 teaspoon butter to the pan and swirl to coat (or use spray oil).
Pour about 1/3 cup of batter into pan and swirl to coat bottom of the pan. Cook for 2-3 minutes, until edges are dry and bubbles appear all over the top.
Carefully slide a spatula under the pancake, flip, and cook the other side 2-3 minutes. Remove to a plate and repeat until all the batter is used.
Serve rolled or folded with fruit, chocolate, syrup, nuts, whipped cream, or peanut butter.