Preheat oven to 180C. Toss butternut in half of the olive oil, season and roast for 25 minutes or until soft and slightly charred around the edges.
In a medium frying pan, place the oil, butter, mustard powder, leeks and onions. Cook on medium heat for 5 minutes, 5 Minutes cover and cook for another 8 to 10 minutes until soft and translucent. 8 Minutes
Place butternut and leeks in the base of a 26cm quiche tin and distribute evenly.
In a medium bowl, mix milk, eggs, flour and baking powder and mix well.
Pour milk mixture over Butternut and Leeks and tap tin to even out the liquid.
Cover the quiche with cheese and bake for 30 to 40 minutes until golden brown and set in the middle (30 Minutes)
Serve warm from the oven with crusty bread and a salad or chilled. Keeps for up to three days in the fridge
Recipe by SAPeople South African Recipes at https://tastyrecipes.staging.sapeople.com/leek-and-butternut-crustless-quiche/