Marble Muffins

Directions

1. 1
   Preheat the oven to 180C.
2. 2
   Beat the butter with the sugar for a few minutes with an electric mixer, until light and creamy.
3. 3
   Add the eggs, one at a time, incorporating each one completely before adding the next.
4. 4
   Sift the flour with the baking powder, and incorporate it with a wooden spoon into the butter/egg/sugar mixture. The batter will be thick.
5. 5
   Place half of the batter in a another bowl, add the vanilla extract and stir.
6. 6
   In the other bowl, add the sifted cocoa and some milk to make the batter less thick, and stir well.
7. 7
   Fill the muffin liners with a spoon by alternating the two types of batter, this will give the muffins the marble effect.
8. 8
   Bake for 20 to 25 minutes, until a toothpick inserted in the center comes out clean.
9. 9
   Remove the muffins from the oven and cool on a wire rack.