Leek, mushroom and feta frittata

Ingredients (4 servings): 25g butter, chopped 1 large leek, halved, washed, thinly sliced 200g button mushrooms, thinly sliced 2 garlic cloves, crushed 200g feta, crumbled 1 tablespoon fresh oregano leaves 8 eggs, lightly beaten 1/3 cup pure cream   Method: Preheat oven to 180°C/160°C fan-forced. Grease a 3cm-deep, 20cm x 30cm (base) pan. Line base…