Preheat oven to 400°F. Line a large baking-sheet with parchment-paper, or you might also lineup two smaller baking-sheets if that is all you've got available.
Place diced onion, diced bell-pepper, quartered zucchini & mushrooms on prepared baking-sheet. Drizzle with olive-oil and throw garlic on top. Generously throw with your hands to coat the veggies with oil and garlic. Roast veggies for 20-25minutes.
While the veggies are roasting prepare the chipotle enchilada sauce: In the bowl of a food-processor, add the sauce ingredients & process for 30 second or till smooth.
Reduce heat in oven to 375°F. Grease a 9x13" baking-pan with non-stick cooking spray. Insert ½ cup enchilada-sauce into the base of the pan and spread evenly.
Put 3 corn-tortillas over the sauce. You might want to cut 1 tortilla in half to make one coating.
Add ½ of those roasted-veggies & half the black-beans in addition to the tortillas. Then drizzle ½ cup of enchilada-sauce on top followed by ½ cup of shredded-cheese.
Repeat the layers , beginning with the three corn-tortillas, remaining beans & veggies, ½ cup enchilada-sauce & ½ cup cheese.
Eventually add 3 corn-tortillas in addition to evenly cover the beans & veggies, then top with remaining enchilada-sauce & 1 cup cheese. Bake for 20-25minutes or till cheese is melted.