- Heat oven to 180 degC fan bake. Grease 12-hole standard muffin tin or use individual silicone cases. Place butter and sugar in a bowl and beat until creamy. Beat in the eggs, vanilla, yoghurt and milk.
- Place cocoa powder and boiling water in a small bowl and stir to combine. Stir this blended cocoa mixture into the wet mixture.
- Sift the flour into a bowl, then gently fold into the combined wet mixture along with the chocolate chips.
- Spoon into prepared muffin tin and bake for 18 to 20 minutes or until firm and golden brown.