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Preheat oven to 180 C (350 F) standard / 160 C (320 F) fan-forced. Line two baking trays with baking or parchment paper.
In a large mixing bowl, add cold butter and sugar. Beat with an electric mixer until combined. Add vanilla and egg. Beat again until combined – but try not to over mix.
Add flour, baking soda and salt, if using, and beat on a low speed until soft cookie dough forms. Add chocolate chips, M&M’s and marshmallows and beat briefly.
Scoop out cookie dough, roughly 2 tablespoons per cookie, and place on prepared oven trays, leaving room for the cookie to spread.
Bake cookies for 12-14 minutes or until golden brown. Leave cookies to cool for 10 minutes before transferring to a wire rack to cool completely.