This peach butter cake is what happens when peak-season peaches meet a little too much impatience. There’s a particular kind of joy that only ripe peaches can bring — the kind where you bite into one over the sink because you simply can’t wait to reach a plate. I had a bowlful sitting on my counter, slightly too ripe to save for another day, and instead of turning them into jam or eating them one by one, I decided they deserved a cake of their own.