Preheat the oven to 425 degrees F. Preheat a large skillet over medium high heat. Add 2 tablespoons extra-virgin olive oil
Add beef and season with chili powder, cumin, and red onion. Brown the meat, 5 minutes.
Add taco sauce or stewed or fire roasted tomatoes.
Add black beans and corn. Heat the mixture through, 2 to 3 minutes then season with salt, to your taste.
Coat a shallow baking dish with cooking spray. Build lasagna in layers starting with meat mixture then tortillas, then cheese. Repeat: meat, tortilla, cheese again.
Bake lasagna 12 to 15 minutes until cheese is brown and bubbly. Top with the scallions and serve.