I find it important to use a non-stick skillet for the sweet potatoes to avoid sticking. I've made them in multiple kinds of pans and my good non-stick skillet really helps them crisp up and not get mushy and sticky.
I use the really small soft shell taco tortillas so the number of tacos you're able to assemble will depend on the size tortillas you use. If you are using larger tortillas that you are filling more, you can up the number of eggs to make them go further. This recipe has a lot of wiggle room, you can make more or less depending on the number you want to make!