Preheat the oven to 400 degrees F. Spray a large baking sheet lightly with olive oil spray. Put the lentils in a food processor and pulse until finely ground. Add the flour, Italian seasoning and 1/2 teaspoon each salt and pepper and pulse until blended.
Transfer the flour mixture to a shallow bowl. Dip each piece of chicken in the mixture, shaking off the excess.
Put the chicken on the prepared baking sheet. Lightly spray a little more oil on top of the pieces and bake until cooked through, 20 to 25 minutes. Top with marinara sauce, mozzarella and Parmesan and return to the oven until the cheese is bubbling, an additional 5 to 10 minutes. Sprinkle with fresh basil and serve.