I did a dumb and don't want to throw away butter and sugar

I'm making the Cook's Illustrated Cranberry Upside Down Cake which is delectable and well worth the higher-than-average number of dirtied bowls/equipment. I put butter into a bowl to soften and then, tired and in auto-mode, added the sugar right on top of the cut chunks. Oh well, no big deal, it'll still soften, right?

But then, while I was cooking the cranberry topping, I absentmindedly moved the bowl close to the stove. I got the cranberries into the prepared pan and turned around and saw that my butter had *melted* and the sugar was melded into it. Swearing, I got out new butter and sugar, started again and finally got the cake into the oven.

Now I have a bowl of butter-sugar mixture (6T butter, 3/4 cup sugar) that has absolutely nothing wrong with it except that it got heated and is now a grainy, luscious-looking mixture. What can I do with this?

TL;DR: avoid baking while fatigued.