Pre-heat oven to 180c/350F. Spray the donut pans on all sides to ensure easy removal.
Place the egg and sugar in a bowl. Mix well using a whisk.
Add the vanilla, oil and milk and mix until well combined.
Add in the flour, baking powder, bicarb soda, salt and cardamom powder.
Mix gently until all the ingredients just come together. Don't over mix the batter.
The batter will be runny, use a cup or jug to pour the batter into each donut hole. Fill till the top.
Place in the oven for 15-20 minutes until a toothpick removed comes out clean. Test this at the thickest part to ensure it's cooked all the way through.
Set aside to cool completely.