To the best of my knowledge you can't make that at home with-out the right equpiment and recipe. They use huge tumblers (which you can buy for a Kitchen Aid mixers) to coat candy products. BUT, I've never seen a recipe for a firm coating like they do so they don't stick to each other. I think that's a trade secret for each candy company.
You'd have more luck making raisin clusters and finding a recipe you like that adds the sweetness taste you crave. Perhaps a simple fondant would please you..... for that, any candy book has fondant recipes.