Preheat oven to 350.
Boil the yuca for about 25 minutes on stovetop.
Remove boiled yuca from heat and drain water.
Combine cooked yuca, plantain, oil, and salt in a blender or food processor.
Blend until pureed (mixture will be thick, like dough).
Cut a piece of parchment paper and line a large baking sheet.
Take a handful of the dough mixture and between two pieces of parchment paper (placing the one you just laid out on the bottom) flatten into a round tortilla by hand.
Repeat process, making another tortilla, and again until your parchment paper is covered with tortillas.
Bake for 15-25 minutes or until cooked through (baking time will depend on how thick your tortillas are).
Once cooked, they will be slightly crisped on the edges, yet nice and pliable.
Allow to cool slightly, then fill them with any of your favorite fillings.