Mix together seasonings: Mrs. Dash Seasoning Blend, onion powder, lemon pepper, and salt. Set aside. Prepare the chicken breasts by flattening with a mallet. Sprinkle the seasoning mixture over both sides of breasts.
Heat olive oil in skillet. Brown chicken breasts lightly on both sides; lower heat and cook until done. Set aside and cool.
Mix together grapes, celery, pecans, and pineapple. When chicken is cooled, chop and add to other ingredients. Add enough poppyseed dressing to comine all ingredients and generously fill the avocado halves. Serve on leafs of red lettuce with a freshly baked loaf of french bread, or sesame crackers.