Step 1

Preheat oven to 180°C/350°F. Spray the holes of a 12-hole (⅓-cup/80ml) muffin pan with cooking oil.

Step 2

Sift flour and sugar into a large bowl. Stir the oil, eggs, yogurt, berries (make sure the berries are still frozen) and chocolate into the flour mixture. Do not overmix. Stir with a wooden spoon about 10 times, ­not too many as the batter should be lumpy.

Step 3

Spoon the mixture into the pan holes. Bake for about 30 minutes. Remove from oven and rest muffins for 5 minutes. Carefully remove the muffins from the pan and put them on a wire rack, top-side up, to cool down.