This is the exact recipe with brands that I used. It tasted great and no one knew it was dairy free. I used homemade marshmallow fluff, I used Recipe #418771. I think any would work either homemade or store bought.
Originally found this on Taste of Home but tweaked it a bit and it is so good.
The burgers come extremely moist and flavorful. The original recipe called for cooked crumbled bacon but I didn't have it so I subbed real bacon bits.