Marble muffins

Ingredients

• 3 eggs
• 1/2 cup sugar
• 1/2 cup yogurt
• 1 & 2/3 cups flour
• 1 Tbsp baking powder
• 6 Tbsp butter
• 2 Tbsp cocoa powder
• 1 tsp vanilla

Topping :

• Chocolate spread (optional)

Preparation

• Whisk eggs with sugar. Add yogurt and combine. Add flour and baking powder and mix well. Finally : add the melted butter and mix again.
• Divide the batter in two batters : in the first batter add the cocoa powder. Mix well.
  
• In the second batter add the vanilla extract and mix well.
• Pour randomly the batters in the muffin tins with tablespoons.
  
• Make some swirls with a wooden stick.
• Bake for 15 minutes at 350°F (180°C).
  
• Remove from oven and leave to cool down. You can add some chocolate spread inside and on top of your muffins.