I’m sure this wasn’t the answer you were expecting Rick and Morty Green Bay Packers shirt after the context in which this whole episode was shown in the intro of Netflix’s Inside Bill’s Brain, I was surprised too. If you are averse to using metal, you can use Teflon bakeware as an alternative. You can use plastic to bake a cake in a microwave oven. The frozen cake batter is a slowed down chemical reaction that is degrading in quality and picking up odd smells from the freezer. It must be completely defrosted and still has to be baked before use and it is unlikely to rise the way fresh batter would. Baking is an art, high temperature ruins your cake, low temperature ruins your cake, less baking soda ruins your cake, more baking soda ruins your cake. Everything needs to be perfect.
Remember what works for one doesn’t work for all, as all ovens are different. You need to make at least 3 or 4 bad cakes to get it right. You will know the temperature, the shelf to put the cake on, the amount of baking soda to add, the difference between new and old baking soda. Everyone has their own technique for making the perfect cake. Just be patient. No, not at all. I’ve tried it and I bake it at home since my mother and sister love having atta gur cake. You can easily substitute sugar with jaggery and add it to the cake batter. Follow the recipe as it is. Just add jaggery (instead of sugar) to water and boil to make sure it melts and then add to cake batter. There is something called “magic cake release”. It is made by combining equal parts by volume of vegetable oil, melted butter, and all-purpose flour. Brush this all over the inside of the pan. Store in the refrigerator, but use it at room temperature.