Fluffy Japanese pancakes - Good Food Middle East

Ingredients

• 2 eggs , separated (you will have 1 yolk leftover, which can be frozen to use in another recipe)
• 25g natural full-fat yogurt
• 70g whole milk
• 70g plain flour
• ¼ tsp vanilla extract
• 13g unsalted butter
• 25g caster sugar
• vegetable oil or spray oil , for frying
• butter, maple syrup, honey, berries or whipped cream , to serve (optional)