#1 Prepare Dinners in large saucepan as directed on package. Meanwhile, heat dressing in large skillet on medium heat. Add chicken and half the onions cook 5 to 8 min. or until chicken is done, stirring frequently #2 Heat oven to 350 degrees Fahrenheit. Spoon Dinners into 13x9-inch baking dish sprayed with cooking spray. Top with chicken mixture. Blend tomatoes and jalapeno pepper in blender until smooth spread over chicken mixture. Top with cheddar cover #3 Bake 30 min. or until casserole is heated through, uncovering after 25 min. Top with cilantro and remaining onions.