Copycat Panera Frontega Chicken Panini

Name: Copycat Panera Frontega Chicken Panini
Ingredients: 0.5 c. mayonnaise; 1 chipotle chile in adobo, finely chopped, plus 2 tsp. adobo sauce; 0.25 tsp. kosher salt, plus more; 0.125 tsp. freshly ground black pepper, plus more; 1.5 c. shredded rotisserie chicken breast; 2 (4x4) slices focaccia, halved horizontally; 0.25 c. fresh basil leaves; 4 oz. mozzarella, room temperature, sliced 1/4 thick; 1 vine-ripened tomato, sliced 1/4 thick; 0.5 red onion, thinly sliced; 1 tsp. extra-virgin olive oil