01 -
Set oven to 175°C. Line a baking sheet with parchment paper.
02 -
Whisk together all-purpose flour, baking soda, and salt in a medium bowl until fully blended.
03 -
In a large bowl, beat softened unsalted butter with brown sugar and granulated sugar for 2–3 minutes until light and fluffy.
04 -
Incorporate the egg and vanilla extract into the creamed mixture until fully combined.
05 -
Gradually mix in the dry ingredients until just combined, ensuring no visible flour remains.
06 -
Gently fold Rice Krispies cereal, semi-sweet chocolate chips, and mini marshmallows into the dough until evenly distributed.
07 -
Spoon rounded tablespoons of dough onto the prepared baking sheet, spacing 5 cm apart.
08 -
Place the tray in the oven and bake for 10–12 minutes, or until edges are golden and centers remain slightly soft.
09 -
Let cookies cool on the baking sheet for 5 minutes, then transfer to a wire rack to cool completely.