Prepare the pasta according to package directions. Cook the pasta al dente (not overcooked). Drain and set aside.
Sprinkle chicken with 1 tablespoon lemon juice and a little salt and pepper. Coat a large nonstick pan with cooking spray. Add chicken pieces. Cook for about 4 minutes, using a spatula, turn over, stir often and continue to cook for about 3-4 minutes, until chicken is cooked completely. Remove to a plate and set aside.
Wipe pan clean and coat with more cooking spray. Melt butter in pan. Add salt, pepper, and garlic. Cook for 1 minute. Stir in white wine, chicken broth, and lemon juice. Cook over medium-high heat until it starts to boil, turn heat down to medium and continue to cook for about 2-3 minutes until the mixture is reduced to about ¾ cup.
Add flour to sauce and whisk until combined. Saute over medium heat for 1 minute. Mix in cooked chicken and saute until heated through.
To plate each serving: Divide ¾ cup pasta on each plate. Spoon about 1 cup of Chicken Scampi with sauce on top of pasta. Garnish each with chopped chives, if desired.
Serve immediately.