Preheat oven to 200ºC (200 C) and prepare muffin pan. Grease muffin pan or fill with paper liners. A nonstick pan requires no greasing.
In large bowl add and combine well eggs, oil, milk and vanilla.
In smaller bowl combine well flour, sugar, cocoa, baking powder, salt and chocolate chips.
Combine wet and dry mixtures and fold together gently until just mixed. Spoon into prepared pan. Bake at 200ºC (200 C) for 20 minutes. Remove from pan and cool on rack.
Hint: Sprinkle extra chocolate chips on top of each muffin before baking.