Preheat oven to 180c. Blend the oats in a blender or food processor until it's completely fine like flour.
In a bowl, mix together the oat flour, wholemeal flour, oil and rice malt syrup. Press the mixture into a lined slice tin and bake for 12 minutes.
Put the greek yoghurt, cream cheese, egg and protein powder in a large bowl. Using an electric beater or whisk, beat/whisk the mixture until smooth.
Pour the cheesecake filling over the base and top with the passionfruit. Bake in the oven for 18 minutes. It should look wobbly like jelly, if it starts to go brown, it's overcooking!!
Leave the cheesecake to set in the fridge for 1-2 hours and then serve