The examples above use chocolate moulds from Kiwicakes . You can either use pre-coloured candy melts OR colour your own white chocolate using candy colour oil based colours or powder colour. (You cannot use gel paste or liquid food colouring, as this will cause your chocolate to seize and make it unsuable)
You can mould them with or without sprinkles. As a single colour or marbled. The choice is yours.
A finished bar weighs less than 100g, making them quite economic to make.
Bars like this are often referred to as "bark" this is the Wilton Happy Birthday Mould, you can find them in other seasonal designs (which are not always bar shaped - but do consider other shapes). Simply melt your coloured chocolate, spoon in to mould, tap on the bench for a good ten taps, to ensure any bubbles trapped are popped. Then lightly sprinkle over your sprinkle medley and allow to cool. They will release easily once set
To create the marble colour simply place your dominant colour in the mould first, then add small blobs of other colours, and stir gently (I use a lollipop stick to do this).Do NOT use your candy colour to do the marbling, as once removed from the mould, the swirls of colour can come off on your hands.
If you're after a traditional bar shape. And you want sprinkles on the side that would normally have the lines where you break the bar apart, take care to look at the example below.
You cannot add just a little sprinkles to the mould, if you do, you will get the result as shown in my photo. as the melted chocolate allows the sprinkles to move around.
You need to pack them right in there and fill it right up.
The bars can be bagged and given as a gift, just like thy are. When placing on a cake, I find they look best at differing heights. You can simply break off a piece of one bar, to make it shorter. It is important when placing on the cake, to cut a narrow aperture for the bar to be pushed in to. If oyu push down in to solid cake, you risk breaking the bar.
These little bars make an affordable take home gift, from your party, and can be made to match the birthday cake.