Nanna's Apple Shortcake

Ingredients

• 125g butter, softened
• ½ cup caster sugar
• 1 tsp vanilla extract
• 1 egg
• 2 cups plain flour
• ½ cup cornflour
• 1 tsp baking powder
• 4 Granny Smith apples, peeled, quartered, core removed and thinly sliced
• ¼ cup caster sugar (extra)
• 1 lemon, juiced
• 1 tbsp plain flour (extra)
• 1 tsp ground cinnamon
• 1 egg white (extra)
• 1 tbsp caster sugar (extra, to bake)
• thick cream (or ice-cream), to serve