Raspberry Secret Centre Muffins

Ingredients

• 2 cups self-raising flour
• ½ teaspoon baking powder
• 1 cup sugar
• 1 teaspoon mixed spice
• 1 teaspoon lemon zest
• 100g butter, melted
• None
• null 1 cup Anchor Blue or Zero Lacto Milk
• 1 egg
• 1/3 cup raspberry jam
• ½ cup icing sugar
• ½ teaspoon vanilla essence
• Juice of ½ a lemon
• ¼ cup crushed freeze-dried raspberries to decorate (optional)