Preheat the oven, with the muffin tray inside, to 230 degrees C.
Now prepare the batter for the pudding.
Whisk the eggs in a medium mixing bowl. Then add both flours, salt and mix well, until all of the flour is incorporated. Leave the batter in the bowl to rest, until it is ready to be baked in the muffin/ cupcake tin.
When the oven reaches the appropriate temperature, carefully remove the tin from the oven and spray tin with the oil spray. Pour the batter from the mixing bowl into a jug, so it easier to pour into the tin, without spillage.
Place the muffin tin with the batter back in the oven and bake for 20- 25 minutes, until Yorkshire puddings will rise and become golden.