This was so easy! Costco has Ghiradelli's brownie mix. The recipe calls for 3/4 cup of oil, some water, an egg. I included 1/4 cup of PC orange-infused canola oil, plus 1/2 cup vegetable oil - and got amazing results! To help drive the theme home, I zested some orange peel in cream cheese icing, and stirred 1 tablespoon of oil into 1/2 cup of frosting, then drizzled this over warm brownies. YUM! What have you done with the oils or the vinegars?