1Heat oven to 350°F. In small bowl, mix salsa and sour cream. Spoon 1/2 of salsa mixture into another small bowl; reserve for topping. To other 1/2 of salsa mixture, stir in 1/2 of the bell pepper and all of the chicken.
2To make 2 stacks, place 2 tortillas on ungreased cookie sheet; spread each with chicken mixture. Spread 2 tortillas with guacamole; place on chicken mixture. Spread 2 more tortillas with refried beans; place on guacamole. Top each stack with reserved salsa mixture, 1 tortilla, remaining bell pepper and the cheese.
3Bake about 15 minutes or until cheese is melted and filling is hot. Cut each stack into 8 wedges.