I bought the wrong kind of flour the last time I went to the grocery store. So, I thought I needed baking powder in order to make some cookies. My recipe is written for self rising flour and I accidentally bought short patent flour. I waited rather impatiently for days until I could get to the store to get baking powder. Well, I looked up the recipe tonight online to see how much baking powder and baking soda to put into the batter and I discovered that I didn't need baking powder at all. I could have made these cookies days ago. I was not happy. But I'm getting cookies now so that's good. I'll just keep working out to work off the cookies.