Pound the chicken to ¼” thick and marinate for 30+ mins in the caeser dressing.
Heat salted water to a boil, and cook the tortellini. Drain when pasta is al-dente.
Heat the olive oil in a skillet and cook the chicken 5-7 mins. When cooked through, remove from heat and cut into bite-sized pieces.
Using the same pan, cook the shallots, garlic and basil for 1 min. Add ¼ cup caesar dressing (use leftover marinade) and ¼-½ cup water. Cook until reduced.
Stir in the chicken and pasta and toss together to coat. Season with salt and pepper to taste.