I don't think it is going to work. I saw what people told you but read this about firecrackers and apply the knowledge to your sandwich.

Flaws include the bread possibly absorbing too much of the oil from the peanut butter and not cooking long enough.

http://boards.cannabis.com/recipes/8...ecrackers.html

I think you are better off making firecrackers and then putting another cracker on top after it cools. You may also want to make a cannabutter recipe and use that somehow, maybe mixing it into the peanut butter or a grilled cheese and butter the inside of the bread, something. I guess brownies isn't a good single serving recipe but always a possiblity. But you also talk about using 10 grams so brownies may be the way to go. You might have to make two batches, one spiked and one not in case your buddy asks for a brownie.