Here is a handy tool that lets you spread butter over your toast conveniently? The Antizer Spreading Heated Kitchen Knife has a food grade zinc alloy surface and ABS handle. It is also waterproof. Only 4 minutes are required for the knife to reach a temperature of 167F.
This heated knife has a 2600 mAh battery which lasts up to 10 days. Costs under $26 at this time.