Sounds like Madamekelly hit the nail on the head. I made a chocolate pound cake one time and mistakenly used self rising flour instead of plain flour. After about 30 minutes I checked on it, and it was all poofed up and running down the sides of the pan into the oven. It was a mess and tasted awful. I did dare to taste it. And cleaning the oven was a horrible job. I make sure the right flour goes in the right canister anymore. Hard learned lesson
sassy granny