Mint Chocolate Chip Cake Recipe | Say Mmm

Ingredients

• 9 tbsp unsweetened cocoa powder
• 1 1/2 cups cake flour (not self-raising, I just used plain flour and replaced 3 tbsp with cornflour / cornstarch)
• 1 1/2 tsp salt
• 1 tsp bicarb soda
• 1/4 tsp baking powder
• 115 g (1 stick) unsalted butter, at room temperature
• 1 1/2 cups caster sugar
• 2 large eggs, at room temperature
• 1/2 cup strong coffee (or water, I used a weak coffee as I didn't want it overpower the mint)
• 1/2 cup whole or low-fat milk
• 280 g (2.5 sticks) unsalted (or slightly salted) butter
• 500 g icing sugar (about 4 cups), sifted
• 2-3 tsp peppermint essence, adjust to taste
• 150 g dark chocolate, very finely chopped or pulsed through a food processor