Wintery Sunday Morning Muffins with Blood Orange Marmalade

Name: Wintery Sunday Morning Muffins with Blood Orange Marmalade
Ingredients: 7 ounces plain flour; 2.5 ounces sugar plus 1 teaspoon for the topping; 2 1/2 teaspoons baking powder; 1/2 teaspoon baking soda; 1/2 teaspoon cinnamon plus 1/2 teaspoon for the topping; a pinch nutmeg; a pinch salt; 160 milliliters milk; 2 ounces butter, melted; 1 egg; 1 1/2 - 2 tablespoons blood orange marmalade