Poffertjes, (pronounced puff' ur jis) or Dutch Mini Pancakes are small, fluffy yeasted treats made in a special cast iron pan. Sold throughout the Netherlands, Poffertjes are traditionally served hot with a pat of butter and a good sprinkling of confectioners' sugar.
Add yeast to lukewarm milk; stir to combine. Allow to sit for about 10 minutes or until frothy.
Whisk together flour, sugar and salt in a large bowl. Add milk/yeast mixture and egg. Beat with electric mixer on high until smooth, about 1 minute. (See Tip 3)
Cover bowl with plastic wrap; let sit until bubbly and doubled in size, about 45 minutes.
Heat Poffertjes pan on medium heat until hot, 3 to 4 minutes. Brush cavities with melted butter. Add about 1 tablespoon of batter to each of the cavities. When small bubbles start to appear and the top starts to look a bit dried out, quickly flip Poffertjes. (See Tips 4 and 5)
Allow Poffertjes to cook on other side until nicely browned, about 2 minutes. Remove from pan. Repeat with remaining batter.
Serve hot with a pat of butter and sprinkling of confectioners' sugar. Yield, about 60 Poffertjes.