Preheat oven to 180C. Grease a mini muffin tray with softened butter and set aside.
Heat a small frying pan over medium heat. Add butter. When butter
has melted completely, add mushrooms and leek, cooking till both are
softened. Remove from heat and let cool.
In a medium bowl, whisk eggs and cream together. Add ham and season
with sea salt and black pepper. Add mushroom and leek, whisking
together well.
Spoon mixture into prepared muffin tray and bake for 10-12 minutes till cooked. Makes 42