Chicken Fajita Enchiladas

Name: Chicken Fajita Enchiladas
Ingredients: 1 can (10 oz) Old El Paso™ red enchilada sauce; 1 tablespoon vegetable oil; 1 green bell pepper, cut into strips; 1 medium onion, sliced; 1 cup sliced fresh baby portabella mushrooms (3 oz); 1 package (1 oz) Old El Paso™ fajita seasoning mix; 2 cups shredded deli rotisserie chicken (from 2-lb chicken); 2 cups shredded Mexican cheese blend (8 oz); 3/4 cup refrigerated white cheese dip; 1 package (8.2 oz) Old El Paso™ flour tortillas for soft tacos & fajitas (10 tortillas; 6 inch)