Mix in the chocolate syrup, powdered sugar, unsweetened cocoa powder, lemon juice, maple syrup, and cinnamon and beat for 1 additional minute until thoroughly combined.
⅓ cup chocolate syrup, ¼ cup powdered sugar, 2 tablespoons unsweetened cocoa powder, ½ tablespoon lemon juice, ½ tablespoon maple syrup, ½ teaspoon ground cinnamon