Preheat oven to 350 degrees. Spray a 9x13 with cooking spray and set aside.
In a medium saucepan, combine diced tomatoes, tomato sauce, green chilis, and buffalo sauce. Bring to a simmer. Put about 1/2 cup of the mixture along the bottom of the pan to coat the bottom. Reserve 1/3 cup of the sauce for the top.
Add the cream cheese to the mixture and stir until melted in the sauce. Add the chicken.
Place 1/4 cup of the chicken mixture off center to each tortilla. Roll up and place n 9x13 inch pan seam side down. Repeat with remaining tortillas.
Top with reserved 1/3 cup of sauce and cheese. Bake for 15-20 minutes until heated through and the cheese is bubbly.