Name: Moravian Spiced Cookie Wafers
Prep time: 30 min
Cook time: 10 min
Yield: 60
Cuisine: American
Ingredients: 235g plain flour; 1/2 tsp fine salt; 1/2 tsp baking powder; 1/4 tsp bicarbonate of soda; 1 tsp ground cinnamon; 3/4 tsp ground ginger; 1/4 tsp ground cloves; 1/2 to 3/4 finely ground white pepper; 1/2 tsp dry mustard powder; 90g unsalted butter, at room temperature; 150g granulated sugar; 85g treacle; 1 large egg yolk