01 -
Preheat oven to 175°C. Lightly grease a 23 x 33 cm baking pan with non-stick spray.
02 -
In a large mixing bowl, beat softened butter with granulated and brown sugars until light and fluffy.
03 -
Incorporate eggs one at a time, mixing well after each addition. Blend in vanilla extract until fully combined.
04 -
In a separate bowl, whisk together flour, Graham cracker crumbs, baking soda, baking powder, and salt.
05 -
Gradually add dry ingredients to wet mixture, mixing just until cohesive. Avoid overworking the dough.
06 -
Evenly press two-thirds of the cookie dough into the bottom of the prepared baking pan to form a uniform base.
07 -
Place chocolate bars in an even layer over the cookie dough base, ensuring full surface coverage.
08 -
Carefully distribute marshmallow cream across the chocolate layer for uniform coverage.
09 -
Break remaining cookie dough into small pieces and scatter over the marshmallow cream, leaving some gaps exposed.
10 -
Transfer pan to oven and bake for 30-40 minutes. The surface should be golden brown, and the center set but still slightly soft.
11 -
Allow bars to cool completely in the pan before slicing into individual portions.