My friend N makes the. best. brownies. • 3/4 cup plain flour • 3/4 cup self-raising flour • 2/3 cup nestle baking cocoa • 1 1/2 cups caster sugar • 1/3 cup walnuts, roughly chopped • 200 grams carton low-fat vanilla yogurt • 60 millilitres light olive oil • 4 egg whites • 2 teaspoons vanilla essence Preheat oven to moderate 180°C. Line a 30 x 20 cm shallow baking pan with aluminium foil. Sift flours and cocoa into a large bowl. Stir in sugar and walnuts, and make a well in the centre. Whisk yogurt, oil, egg whites and vanilla essence together in a small bowl. Pour onto dry ingredients, and mix lightly and quickly until just combined. Spread into prepared pan and smooth the surface. Bake for 30 minutes or until a skewer inserted into the centre of the tray comes out clean. Leave in the tin for about 15 minutes, then lift out and peel the foil away.