To make the enchiladas filling: Strip the leaves from the stems of the Swiss chard, and chop the leaves and coarsely slice the stems; and set aside.
In a large skillet over medium high heat, heat the 2 tablespoons oil. Add the potatoes and cook until golden brown and tender, about 8 minutes. Season with 1/4 teaspoon of the salt, and pepper, to taste. Remove from the pan with a slotted spoon, and drain on a paper towel-lined plate. Add the onions and garlic, and cook until translucent, about 4 minutes. Add the Swiss chard stems, cook until softened, about 4 minutes. Add the leaves, and remaining salt and pepper, cover, stirring occasionally, until the leaves are wilted, about 5 minutes more. Transfer the mixture to a strainer over a medium bowl, drain off any excess liquid, and cool. Combine the potatoes with 1/2 cup of the cheese and the Swiss chard mixture, and set aside.
To make the salsa: Put the tomatillos in a medium saucepan and cover with water by about an inch. Bring to a boil, lower the heat, and simmer until tender, about 7 minutes.
In a blender, combine the onions, garlic, jalapeno, 3/4 teaspoon salt, and puree until smooth. Using a slotted spoon transfer the tomatillos to the blender, along with about 1/4-cup of the cooking liquid, puree until smooth. Add the coriander and blend briefly.
To assemble the enchiladas: Pour enough vegetables oil into a skillet so it is about a 1/4 deep, and heat over high heat. Fry the tortillas one at a time, until they are soften, about 5 seconds. Transfer to a paper towel-lined plate to drain.
Preheat the oven to 350 degrees F. Pour about a cup of the tomatillo salsa into the bottom of 13 by 9 inch baking dish. Put 2 heaping tablespoon of the Swiss chard mixture in the center each tortilla and roll them up. Place the tortillas, seams side down, on the sauce laying the enchiladas snuggly next to one other. Spoon the remaining sauce over the enchiladas and sprinkle with the remaining cheese. Bake until the enchiladas are heated through and the cheese is softened, about 20 minutes. Serve with sour cream on top, if desired.
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