I wouldn't usually profess the virtues of a packet mix, but I love the woollies home-brand vanilla one, and get this it's only 65c! I make it often with a simple lemon buttercream icing, SO cheap and really yummy. I would never have thought to try it but there were so many recs for it in the food/entertaining forum on here I gave it a shot.
I made it as cupcakes for a friends party and everyone absolutely raved about them (and that was just with a simple vanilla buttercream icing), some said they were the best cupcakes they'd ever had! (Not sure how much they get out LOL)
Definitely try it out if you're thinking of going down this road!
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