Bacon Muffins with Hard-Boiled Egg

Ingredients

• 4 bacon slices
• 1 cup flour
• 1 teaspoon baking powder
• 1 teaspoon baking soda
• 2 tablespoons of sour cream
• 1 egg
• 1 tablespoon apple cider vinegar
• ½ cup milk
• 2 ounces of butter, melted
• 1 spring onion, chopped
• ½ cup mozzarella, shredded
• 12 eggs