I had butterscotch chips, mini chocolate chips and walnuts in the cabinet and wanted to bake something sweet. I adapted Mark Bittman's Butterscotch Brownie recipe in his cookbook How to Cook Everything. This is one of my favorite cookbooks for straight-forward, adaptable, how-to-do-it recipes and this one is no exception. It's a simple one bowl recipe and came out great with what I had on hand. The mini chocolate chips just melted in and the walnuts added a little crunch to the otherwise fudgy consistency.