In a saucepan melt the butter. Remove the pan from the plate. Stir in sugar, oatmeal, wheat flour, milk, treacle, ginger and baking powder to make a smooth batter.
Scoop out the batter, about 1 tbsp to each crisp, with a fairly large distance on a sheet of parchment paper, as the batter floats out when the crisps are baked.
Bake the crisps in the middle of the oven at 200 ° C for about 5 minutes or until they have a nice golden colour. In a fan assisted oven 175 ° C for about 8 minutes.
Let the crisps cool on the plate for a few minutes before moving them to a rack to cool completely.