1. Preheat oven to 425 degrees. In a food processor, combine
cilantro, scallions, 1 teaspoon salt, and 1/4 teaspoon pepper with as
much spinach as will fit; pulse, adding remaining spinach in batches,
until coarsely chopped.
2. Coat an 8-inch square baking dish with cooking spray. Lay 4
tortillas in bottom of dish (they will overlap slightly). Layer with
half of beans, salsa, spinach mixture, and cheese; repeat with
remaining ingredients, ending with cheese and pressing in gently.
3. Cover dish with foil; place on a rimmed baking sheet. Bake until
bubbling, 25 to 30 minutes; remove foil, and continue baking until
golden, 15 to 20 minutes more. Cool 5 to 10 minutes before serving.
