Step 1

In a large bowl, combine mustard, oil, lemon juice, and dill. Add chicken breasts, turning to coat completely; cover and chill about one hour.

Step 2

Coat a grill pan or skillet with cooking spray and heat over medium heat until hot. Place chicken on pan; discard excess marinade.

Step 3

Cook 5 to 6 minutes per side, or until chicken is no longer pink.