BEST Mars Bar Cookies

Easy Mars Bar cookies filled with gooey caramel and chunks of milk chocolate.

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Prep Time: 15

Cook Time: 12

Total Time: 27

Servings: cookies

Calories: 343kcal

Preheat your oven to 180°C (160°C for fan ovens). Line two large baking trays with baking paper.
Using an electric whisk or stand mixer, mix the butter, caster sugar and brown sugar together in a large bowl. It should look like a thick paste.
Next, add the egg and the vanilla extract and mix well until smooth.
Add in all of the self-raising flour and mix it in. When it starts to stick together, use your hands to press the mixture into a ball of dough.
Add the chocolate chips and chopped Mars Bars. Carefully knead them into the dough with your hands.
Divide the dough into 12 equal-sized pieces and roll each piece into a ball. Try to ensure the Mars Bar pieces are more towards the centre of the balls rather than the edges. This will prevent caramel spilling out and burning.
Place the dough balls on your lined tray(s), making sure to leave a couple of inches between each cookie to allow space for spreading. I recommend baking 4-6 per tray.
Bake the cookies, one tray at a time, for 11-12 minutes. As soon as you see a slight golden brown colour at the edges, remove them from the oven. They'll still be pale and wobbly in the middle but will firm up as they cool. Don't keep baking them or they'll end up hard and crispy.
Let the cookies cool completely before removing them from the tray.

If the dough is too sticky, you can add more flour. If it’s too dry, add a splash of milk to help it stick together.
If caramel spills out of the sides while baking, you can use a large cookie cutter or spoon to gently shape the cookies back into circles while they’re still warm.