Melt butter and chocolate in a microwave-safe bowl in for about 1 minute until melted, stirring every 30 seconds. Set aside.
In a separate large bowl, use an electric beater and beat egg, egg yolk, vanilla extract, and sugar together until well blended.
Then add flour, the chocolate mixture, and a pinch of salt and stir until combined. Pour the mixture into the ramekins, filling each one about halfway.
Place in the air fryer basket and air fry on 370 degrees Fahrenheit for 8-10 minutes.
Once done air frying, use a clean thick dish towel to remove ramekins from the air fryer basket. Allow cake to cool in a ramekin for about 1 minute. Use a butter knife to loosen the cake from the ramekin and turn over onto a plate. Serve with fresh whipped cream, fresh berries, or topped with powdered sugar and enjoy.
Different air fryer brands will cook these at different speeds, hence the 8-10 minute cook time. These should not take longer than 10 minutes to cook.