Preheat the oven to 375°F (190°C).
Line a rimmed baking sheet with aluminum foil and place an oven-safe cooling rack inside; lightly spray the rack with non-stick cooking spray.
In one shallow bowl combine 1 cup finely crushed garlic-flavored croutons and 3/4 cup grated Parmesan.
Place the 1/4 cup all-purpose flour in a second shallow bowl.
Pour 1/2 cup creamy Caesar dressing into a third shallow bowl for dredging.
Pat the chicken thighs dry. Dredge the skin-side (exposed skin) or skinned part of each thigh lightly in flour, shaking off excess.
Dip the floured part of each thigh into the Caesar dressing, then press into the crouton-Parmesan mixture so it adheres evenly.
Arrange the coated thighs skin-side up on the prepared rack so air can circulate for crisping.
Bake in the preheated oven for 35 to 40 minutes, or until the chicken reaches an internal temperature of 165°F (74°C) and the coating is golden and crisp.
While the chicken bakes, toss the chopped Romaine lettuce with the reserved 2 tablespoons Caesar dressing, 1/4 cup grated Parmesan, and 1/2 cup garlic-flavored croutons.
Serve the crispy chicken thighs with the quick Caesar salad alongside.