Spray a medium pot with oil and and add garlic, sauté 30 seconds. Add chipotle chiles, chili powder, cumin, broth, tomato sauce, salt and pepper. Bring to a boil. Reduce the heat to low and simmer for 5- 10 minutes, to let the flavors meld. Set aside until ready to use.
3
Heat the oil in a medium skillet over medium-high heat. Sauté onions and garlic on low until soft, about 2 minutes. Add beans, salt, cilantro, cumin, oregano, chili powder, tomato sauce, broth, and cook 4 to 5 minutes. Remove from heat.
4
Spray a 13 by 9-inch glass or ceramic baking dish with oil. Put 1/3 cup bean mixture into each tortilla and roll it.
5
Place on baking dish seam side down, top with sauce. Then top with cheese.
6
Cover with foil and bake in the oven on the middle rack for 20- 25 minutes, until it's heated through and the cheese is melted. Garnish with scallions or cilantro.