Grease a 12-cup muffin pan.
Line cups with half the baby marrow ribbons.
Divide remaining baby marrows, salad onions, mint and feta between muffin cups. Season.
Pour over beaten egg and bake for 15-20 minutes or until puffed up and golden.
Remove from oven and cool for 5 minutes before turning quiches out of muffin cups.
Replace the feta with diced mozzarella or cheddar.
Boost your daily vegetable intake by adding some blanched spinach or frozen peas to the quiches.