PREHEAT oven to 375°F. Place tortillas in single layer on baking sheets; brush evenly with 1 Tbsp. of the dressing. Bake 6 to 8 min. or until tortillas are crisp and lightly browned.
HEAT 3 Tbsp. of the remaining dressing in large skillet on medium-high heat. Add peppers; cook and stir 3 min. or until crisp-tender. Add tomatoes, pineapple and chicken; cook and stir 3 min. or until heated through.
TOSS greens with remaining 1/4 cup dressing in large bowl. Place tortillas on salad plates. Spoon greens mixture evenly onto tortillas; top with the chicken mixture.
