1. Combine flour, baking powder, sugar and salt in a big bowl.
2. In a second bowl combine egg, oil and milk. Add this to the dry ingredients.
3. Fold in chocolate chunks and chopped nuts.
4. Spoon batter into prepared muffin tin and bake in the preheated oven at 180°C/350°F for about 25 minutes or muffins are nicely browned on top and a toothpick inserted in the centre comes out clean.