Hot Chocolate Cookie Bars are soft and chewy hot chocolate flavoured cookie bars filled with mini marshmallows for the ultimate comforting, late night treat!
Preheat the oven to 180°C (350°F) and line a 9"x9" with baking paper.
Beat the butter, brown sugar and sugar together.
Beat in the eggs and vanilla extract.
Beat in the flour, baking powder, baking soda and hot chocolate until well combined.
Stir through 120g of the mini marshmallows and spread in an even layer in the prepared pan.
Top with the remaining mini marshmallows and place in the oven for 20 minutes. The middle will look slightly underdone but a skewer inserted in the middle will only have loose crumbs attached.