I did this just now but it took too long. Short answer: not worth the time. This became a 2 step process. I put the microwave popcorn bag in the oven, baked on about 400 degrees, long enough for the oil to melt. Once the butter melted inside, the bag got a little puffy, while still in the oven. I removed the bag, opened the bag and dumped the contents into a stove top pan, slid out like magic. Popped as usual on top of the stove. It tasted great.