Here's my gluten free 'Smarties' cookies recipe using Aldi's Choc Ums which taste EXACTLY like Smarties... but of course, they're gf!
In a large bowl, mix together both your light brown sugar and caster sugar with your melted hard margarine. Mix until it all comes together and is fully combined.
Add your egg and vanilla extract to the bowl and continue to mix (with a wooden spoon) until combined once more.
Add your flour, salt and bicarbonate of soda to your bowl and mix until combined. It can be hard work and takes time to really combine it all but it'll form a perfect cookie dough (you could use a stand mixer but I prefer to do cookie dough by hand).
Add the about 130g of the gluten free smarties to the mixture and give them a good mix in so they are dispersed evenly.
Cover your mixing bowl with clingfilm and chill in the fridge for about 45 minutes (you can make the cookie dough ahead of time also and keep it in the fridge until you need it).
Heat your oven to 160C Fan and prepare a couple of baking trays with good quality, non-stick baking paper.
Remove your cookie dough from the fridge and roll your dough into balls (about the size of a golf ball). Use your remaining 30g of gluten free smarties to place 2-3 in the top of each ball. This will ensure that you get the nice bright colours showing through on every cookie.
Place the cookies on your trays. The cookies will spread a little so leave some gaps between them - I usually cook mine in a couple of batches.
Pop into the preheated oven for 13-15 minutes - they should have flattened out to look more like cookies and be a lovely golden colour
Remove from the oven and leave to cool on the baking tray before moving them.