Prepare the marinade: Combine olive oil, red wine vinegar, Dijon mustard, crushed red pepper, black pepper, rosemary, and 1 tablespoon of salt.
Coat both sides of the chicken breasts with the marinade. Marinate for at least 4 hours or overnight.
Grill the chicken: Prepare the grill until the coals begin to reduce in size.
Toss the marinated chicken onto the grill and cook for approximately 7 minutes per side, until cooked through.
Remove the grilled chicken and let it cool completely before assembling the salad.
Dice the cooled chicken into bite-sized pieces.
In a bowl, toss the diced chicken with the minced green bell pepper and green onions.
Add the avocado mayo, ground mustard, dill, and ½ teaspoon of salt. Add pepper to taste.
Mix all ingredients thoroughly.
Allow the salad to sit and chill, or serve immediately.