Double Chocolate Sweet Potato Muffins

INGREDIENTS

150 g

dark chocolate ((5 ounces) 70% cocoa solids)

75 g

butter ((5 tablespoons))

250 g

baked sweet potato ((1 cup) mashed)

large eggs

250 milliliters

milk ((1 cup))

150 g

soft light brown sugar ((1 cup))

1/2 tsp

vanilla extract

salt

110 g

spelt flour ((1 scant cup))

110 g

plain flour ((1 scant cup))

30 g

cocoa powder ((4 tablespoons))

1 tbsp

baking powder

1 tsp

bicarbonate of soda ((baking soda))

150 g

dark chocolate chunks ((5 ounces))