Preheat oven to 375°F and lightly grease an 11x7' baking dish.
Heat oil in a large skillet over medium heat. Add zucchini, onion, poblano, and garlic; cook until softened, stirring occasionally, about 7 minutes. Add cumin, salt, pepper, and quinoa; cook 1 minute, stirring often, until quinoa is lightly toasted. Add broth, bring mixture to a boil, reduce to a simmer, cover and cook until liquid is absorbed and quinoa is cooked, about 12 to 15 minutes. Remove from heat and stir in beans.
Spread 1/4 cup enchilada sauce in prepared baking dish. Pour remaining sauce into a shallow bowl or pie plate. Working one at a time, dip tortilla into sauce to lightly coat both sides. Transfer to a plate, then place a heaping ¼ cup filling into the top center. Roll up and place seam side down in baking dish. Repeat until you’ve used all 8 tortillas (arrange them tightly in pan). Pour any remaining sauce overtop and sprinkle with cheese.
Bake enchiladas until cheese is melted and bubbly, about 25 minutes. Broil for 2 minutes on HIGH, if desired, for a golden top. Garnish with toppings of choice.
Notes
If using a 13x9" baking dish, you should be able to fit 10 enchiladas in the pan with enough filling.