I use this recipe from CatCanCook, and I can attest that they really are foolproof because (A) I absolutely cannot make banana bread, but I can make these, and (B) they always, always, always turn out perfectly.
It should be noted that I dislike bananas and also don't eat these muffins, but I can appreciate that they're really gorgeous-looking muffins. The kids love them. Darling Husband loves them. And I love the fact that they make an incredibly easy breakfast.
"Kids, go downstairs and grab a muffin. I'll be down ... soon."