Prep: 1. Preheat oven to 350. Grease a large baking sheet and a 9x9 baking dish. Make: 1. Poach chicken: bring water to a boil. Add chicken and return to a boil. Cook 3 minutes, then cover with a lid and remove from heat. Let stand until chicken is cooked through, about 15 minutes. (or use leftover chicken) 2. Meanwhile, cut tortillas into 1 to 2 inch strips. Spread strips onto baking sheet and bake for 5 minutes. 3. While chicken and tortillas are cooking/cooling slightly, grate cheese, chop cilantro and scallions, and cube cream cheese. 4. Shred chicken. 5. Whisk together all ingredients except tortillas and grated cheese. 6. Place a layer of tortillas in the prepared baking dish. Top with half the chicken mixture and half the cheese. Top with another layer of tortillas, filling and cheese. Top with a final layer of tortillas and a sprinkling of cheese. 7. Bake for 35 minutes until top is golden and bubbly.