140gred & green M&Ms, plus a few extra to press on top before baking (see note 1)
Instructions
Preheat the oven to 180°C/350°F (160°C fan). Line 2 baking trays with baking paper.
Place the butter cubes into the Thermomix bowl. Mix for 12 sec/speed 5 until softened. Scrape down the sides of the mixing bowl with a spatula.
Add the brown and white sugar to the mixing bowl. Mix for 20 sec/speed 4. Scrape the bowl thoroughly, including under the blades. Mix again for 15 sec/speed 4, until smooth and creamy.
Add the egg and vanilla extract. Mix for 15 sec/speed 3. Scrape and repeat once more.
Add the flour, bicarb of soda and salt. Mix for 10 sec/speed 4, scrape down the bowl, then mix again for 3 sec/speed 4.
Stir in the M&Ms by hand with a spatula so they don't get crushed by the blades. Tip: Transfer the dough to a regular mixing bowl. I find it much easier to scoop and shape the dough this way without the Thermomix blades getting in the way.
Roll the dough into walnut-sized balls and place them 5cm apart on two baking trays. Carefully press a few extra M&Ms on top. Tip: If the dough feels too soft, chill it for 20 minutes before shaping.
Bake one tray at a time for 12-14 minutes, until golden around the edges but still soft in the centre. Keep the second tray chilled in the fridge while the first bakes.
Leave the cookies on the trays for 5 minutes, then transfer to a wire rack. They will firm up as they cool.
Notes
Note 1: Red and green M&Ms are usually available at Coles and Woolworths during November and December. A 165g packet gives you enough for the dough plus extra M&Ms for topping.To Make Ahead: The dough freezes well. See my cookie dough freezing guide for details.Storage: Store the cookies in an airtight container in the pantry for up to 5 days. Freeze for up to 2 months, then thaw at room temperature.