Pre-heat oven to 210°C
Spray 4 holes in a small to medium sized muffin tray with a decent amount of low calorie cooking spray and place in the oven until it starts foaming slightly
Do not open the oven door, but after about 10 minutes turn the oven down to just under 200°C and allow to cook for another 5 - 10 minutes (you should be able to take a look after about 15 minutes)