Place the unsalted butter in a large microwave safe bowl. Microwave for 20-30 seconds until the butter has melted.
150 grams Unsalted butter
Mix in the caster sugar and light brown sugar until smooth.
100 grams White caster sugar, 120 grams Light brown sugar
Mix in the maple syrup, whole egg and egg yolk.
2 teaspoons Maple syrup, 1 medium Whole egg, 1 medium Egg yolk
Stir the flour, cornflour and salt together in a separate bowl. Then add to the mixture and fold to make a thick cookie dough.
280 grams Self-raising flour, 1 teaspoon Cornflour, 0.5 teaspoon Salt
Add the M&Ms (save a handful for decorating later), crushed pretzels and mini marshmallows. Fold into the cookie dough.
120 grams Red and green M&Ms, 50 grams Salted pretzels, 50 grams Mini marshmallows
Line a baking tray with greaseproof paper. Scoop up heaped tablespoons of dough, shape into a ball, and arrange on the tray. You should be able to make 12-14 cookies in total. Cover the tray with clingfilm and place in the fridge to chill for 2 hours. During this time, the flavours will develop and the dough will firm up which will reduce the spread in the oven. Less spread = thicker cookies!