Welcome to the board. Yes, you can use muffin pans to make tarts i know lots of people do it that way and I have too If you look at the bottom of the page it may have some similar questions people have asked....or if that doesnt help you can always use the search feature Also i use Ecosoya PB too! Hope this helps some! Enjoy making tarts...its deff addicting Jessica ETA: I dont use any mold release with Ecosoya PB but just remember not to try and take the tart out of the molds to quick or else it will crack...another tip is too put them in the freezer for a few mins and pop them out!