My DD made these with a friend who had the recipe, and really loved them. They used a jarred vegan sauce, but this one looks pretty simple. If you aren't a strict vegan you could add some cheese on top.
Place all the sauce ingredients, except for the cornstarch, in a small pot and cook over low heat, covered, for 20 minutes. Stir in the cornstarch and cook until the sauce thickens.
While sauce is cooking, prepare the filling: Mix the tofu, onion, chili powder, cumin, garlic, pepper, and picante sauce.
Put some of the spinach in the middle of each tortilla, then add 3 to 4 heaping teaspoons of the tofu mixture, and roll up the tortillas.
Lay the enchiladas in a baking dish, top with vegan sour cream, cover with sauce, and bake for 20-25 minutes.