What can I do with some peanut butter?

I love peanut butter, but I want some new healthy and creative recipes that I can use peanut butter. Any ideas besides a pb&j sandwhich? Nothing with milk unless it's almond please! =)

And if you have any for canned tuna without mayo. lol
Update: thanks for all those recipes! I should have added more details to what i'm looking for. I'm pescetarian so I don't eat meat other than fish, and I need simple. lol Love the dessert ideas!
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