Sorry, didn't see the questions.... yup, bake at 350*

I don't know that I would bake them in cupcake tins without anything to give it a crust. You'd just be scooping out custard, which is yummy, but not a suitable server. You could use little custard cups and bake them, and serve in a custard cup, or a cup you use for individual creme brulees. Without the crust there is no support for the custard, that's all.