Google the phrase How to bake in a mason jar and alllllll sorts of things pop up. There's tons of cute pictures and even video tutorials of baking in mason jars. You'll read mason jars can be placed in a warm water bath and then placed in an oven. You'll even see people putting jars directly in a hot oven.
But here's how you really bake in a mason jar...you don't. Yes - never, and I mean never, bake in a mason jar and here's why.
I'm not a fancy pastry chef nor did a train at an even fancier culinary school. I'm just a gal who bakes with love.