In the same pot, heat the olive oil. Add the onion, jalapeno pepper, garlic, and bay leaf and cook until the vegetables begin to soften, about 5 minutes. Add the beans and cover with water by about 1-inch. Bring to a boil, reduce the heat, cover, and simmer for 1 to 1 1/2 hours, or until the beans are tender. Remove the bay leaf and discard. Taste the beans and season with salt and pepper.
Change the temperature of the oven to 350 degrees F and begin assembling the dish. Take a large baking dish and smear the bottom with some of the reserved tomatillo salsa. Now take the flour tortillas and briefly flash them over the stove-top flame (or put them briefly under the broiler if using an electric stove). Using a shallow bowl, coat each tortilla lightly with the reserved salsa mix. Put a scoop of the shredded chicken-enchilada mix on top of the tortilla followed by a sprinkle of the shredded cheese. Fold the tortilla over the filling and roll like a cigar to enclose it. Using a spatula place the tortillas in the baking dish and continue to do the same with all the tortillas. Finally pour over some more of the salsa and top with the remaining shredded cheese. Bake uncovered for about 30 minutes until bubbly and cracked on top. Garnish, cilantro and tomato.
Serve hot with Spicy Black Beans and Yellow Rice, the remaining tomatillo salsa, sour cream and fresh guacamole, if desired.