Mix all ingredients together in a small bowl then taste and adjust salt and pepper if necessary. Scoop 2-3 Tablespoons dressing into the bottom of each mason jar then set aside.
For the Mason Jar Salads:
Season chicken breasts on both sides with garlic salt and pepper then saute in a nonstick sprayed skillet over medium-high heat until cooked through. Chop into bite-sized pieces then cool completely.
Divide remaining ingredients evenly then layer in the following order on top of the dressing in the jars: celery, apples, cooked then cooled chicken, sliced almonds, dried cranberries, green onions, and lettuce. Screw on lids then store in the fridge for up to 3 days.