Karen, could you tell if it was the peanut butter that was nasty or was it the milk? My husband is about 5 weeks post-radiation and his taste is very, very slowly starting to come back, and anything milk-based is extremely chalky. He can't taste peanut butter at all and he can't handle the texture yet but it's such a good source of protein that I make him smoothies using powdered peanut butter (this kind:
http://amzn.to/W2oirG). Because of his milk aversion I use vanilla-flavored soy milk, a couple of teaspoons of peanut butter powder, a scoop of vanilla whey powder (why he can drink this and not milk, I don't know, but the taste doesn't bother him), a Boost Plus (higher calories), and a packet of Benecalorie (this stuff:
http://bit.ly/ZFUssj). Altogether it's like 900 calories so he gets a couple of those a day. Sometimes I throw a banana in, too.
He's also very anxious for his taste to return. He spends a lot of time on the internet looking up recipes he wants me to try when he can eat normally again.
