Caramelised onion, mushroom, cheese quiche recipe | Safefood

Ingredients

• 120g / 4 oz. of rolled oats
• 65g / 2½ oz. of plain flour
• ¼ teaspoon of salt
• 3 tablespoons of cold, unsalted butter, cut into small pieces
• 3 tablespoons of cold, low-fat buttermilk
• 4 teaspoons of olive oil
• 1 large onion, sliced thinly into half moons
• 225g / 8 oz. of sliced mushrooms, try a mixture of edible varieties
• ½ teaspoon salt
• ¼ teaspoon freshly ground black pepper, to taste
• ¼ teaspoon dry mustard
• 1 tablespoon of chopped fresh thyme leaves or 1 teaspoon of dried thyme
• 6 medium eggs. 3 whole and 3 just whites
• 255g / 9 oz. of evaporated fat-free milk, not condensed milk
• 75g / 2½ oz. of low-fat cheddar cheese, grated