1. Sift the dry ingredients together in a large bowl.
2. Whisk the egg, milk and peanut butter together and slowly whisk into the dry ingredients, making sure the batter is free of lumps. Leave the mixture to rest for 15 minutes.
3. Heat a non-stick pan and spoon tablespoonfuls of batter into the pan. When bubbles appear, turn and cook until the crumpets are light golden brown.