Preheat the oven to 375° F and line 2 baking sheets with parchment paper. Place the chopped vegetables in a large mixing bowl and drizzle with olive oil, salt and chili powder. Toss everything together so that the vegetables are coated in oil and seasoning. Spread the vegetables over the two baking sheets and bake for 20-30 minutes, or until golden-brown and cooked through. Lower the oven temperature to 350°F.

Pour ¼ cup of salsa into the bottom of a large casserole dish and spread it around. Arrange 8 of the corn tortilla halves (or 4 whole corn tortillas) in the bottom of the casserole dish (it’s okay for the tortillas to overlap).

Add 1/3 of the roasted vegetables, followed by 1/3 of the grated cheese and 1/3 of the salsa. Repeat for two more layers using the remaining ingredients, ending with the roasted vegetables and grated cheese as the top layer.

Place the casserole dish on the center rack of the oven and bake for 30 minutes, or until the cheese is melted. Remove from the oven and allow enchiladas to cool at least 20 minutes before cutting into squares and serving. Note: If transporting the enchiladas, allow them to cool to room temperature, then cover with plastic wrap or foil.