Blueberry chocolate muffins with coffee cinnamon icing

Spongy airy chocolate spicy blueberry bountiful muffins! Purrfect winter tea treat:) The ingredients were accurately measured on scales, hence in grams. Yield: 12 muffins        Ingredients 140 g oil 200 g sour cream 3 eggs 110 g sugar 3 tablespoons dark cocoa powder 175 g all-purpose flour 1/2 teaspoon chili powder 1/2 teaspoon bicarbonate…