Pour 1/3 cup enchiladas sauce on the bottom of a 9 x 12 inch baking dish. Preheat the oven to 350°F.
In a medium bowl, whisk the egg whites, water, and a pinch salt and pepper. Lightly coat a large nonstick skillet with cooking spray and heat the skillet over medium heat. Add 1/4 of the egg whites (about 1/2 cup), swirling to evenly cover the bottom of the pan. Cook until set, about 2 minutes. Flip and cook the other side until set, about 1 more minute. Set aside on a dish and repeat with the remaining eggs until all your egg “tortillas” are cooked and set aside. Should make 6.
Heat oil in a medium non-stick skillet over medium heat. Add scallions; cook for 2 to 3 minutes until fragrant, but not brown. Add tomato and cilantro, season with salt to taste and cook 1 more minute, until soft. Stir in spinach and green chile, and cook for about 5 more minutes, adjust salt and pepper to taste. Remove from the heat, and mix in 1/2 cup of the Colby-Jack cheese; mix well.
Divide spinach between egg white “tortillas”, about 1/3 cup each and roll, place each seam side down in baking dish. Top with remaining enchilada sauce and remaining cheese, cover with foil and bake until hot and the cheese is melted, about 20 to 25 minutes.
Serve topped with diced avocado and scallions.