Step 1

Preheat the oven to 425 degrees F.

Step 2

Place poblanos, red bell peppers, cauliflower, sweet potato, onion, and corn kernels onto a large, rimmed baking sheet. Drizzle oil and sprinkle the cumin and granulated garlic over top. Add a generous pinch or two of salt and black pepper, then use your hands to mix everything together. After everything is coated well, spread the vegetables evenly in the pan.

Step 3

Roast for 30-40 minutes on a lower oven rack until vegetables are tender and begin to brown in spots. Stir or shake the pan every 10 minutes for even roasting. Remove pan from oven and reduce oven temperature to 350 degrees F.

Step 4

Prepare an 9x13" baking pan with nonstick spray.

Step 5

In a small bowl, stir the cilantro into the salsa. Spread 1/2 cup of salsa into the bottom of the baking pan. Add a layer of tortilla pieces, to completely cover the salsa. Top with 1/3 of the vegetables, a handful of spinach, and 1/3 of the cheese. Make a second layer of tortilla, 1/2 of the remaining salsa, vegetables, spinach, and cheese. Top with with a layer of tortillas, salsa, vegetables, and cheese.

Step 6

Cover with aluminum foil. Bake for 20 minutes. Remove the foil and bake another 10 minutes, until cheese is melted and everything is heated through.

Step 7

Let it sit for 5 minutes and cut into squares. Serve with sour cream and a sprinkle of sliced scallions.