Brown the butter

• Melt the butter in a saucepan over medium heat.
• Cook until the milk solids turn golden and nutty, then set aside to cool.

Mash the plantains

• Peel the ripe plantains and mash them until smooth.
• Keep a few thin slices aside for topping the cookies.

Make the cookie dough

• Whisk the brown butter with the brown sugar and granulated sugar.
• Beat in the egg, vanilla extract and mashed plantain.
• Fold in the flour, baking soda, salt and cinnamon until just combined, then stir in the chocolate.

Chill the dough

• Cover the dough and refrigerate until firm.

Shape the cookies

• Scoop the dough into balls onto a lined baking tray.
• Top each with a slice of plantain.

Bake

• Bake at 180 °C until the edges are set and the centers are soft.
• Let the cookies cool on the tray before serving.