Cut the chicken breasts in half (similar to butterflying), then cover in plastic or wax paper and pound the chicken until thin and has a consistent thickness throughout.
Season one side of the chicken breasts with salt and Flavor God Garlic Lover's Seasoning. Add 1 tbsp of pesto to each breast and spread evenly, then layer with mozzarella and tomato slices.
Roll chicken up so that the pesto, mozzarella, and tomato are contained inside. Use toothpicks to help hold the chicken rolled up and closed.
Pre-heat air fryer to 400 degrees.
Add egg to a bowl and whisk until beaten. Add breadcrumbs to a plate (you may want to put more than 1/3 cup on the plate to make coating the chicken easier, but you will only use about 1/3 cup on the chicken). Dip chicken in egg wash, then coat in breadcrumbs.
If desired, spray air fryer basket with oil (I didn't use any, but some air fryers are more non-stick than others). Place rolled and coated chicken in the basket, being careful not to overcrowd (I did two roll-ups at a time). Cook for 12-14 minutes or until the chicken is cooked through, flipping halfway if needed.
Serve with high quality balsamic vinegar or balsamic glaze, if desired.