Preheat oven to 400 degrees and line a baking sheet with aluminum foil sprayed with nonstick spray.
Use 3 shallow dishes for the chicken breading – 1 with whisked eggs, 1 with flour, salt, pepper, and garlic powder, and 1 with panko and parmesan.
Coat the chicken breasts in egg, then flour/seasonings, then panko and parmesan and place on baking sheet.
Bake for about 20 minutes.
Remove from oven and spoon pasta sauce on each filet then sprinkle on mozzarella cheese and bake 10 more minutes.
In a small bowl mix pesto and mayonnaise until well combined.
Spread the pesto mayo on the bottom ciabatta buns.
Spread pasta sauce on the top ciabatta buns.
Place a piece of chicken on the bottom bun and assemble.