Prepare the Marinade: In a medium-sized bowl, combine 1/4 cup of honey, 1/4 cup of Dijon mustard, 2 tablespoons of olive oil, 2 cloves of minced garlic, 1 teaspoon of salt, 1/2 teaspoon of pepper, and 1 tablespoon of lemon juice. Whisk until well blended.
Marinate the Chicken: Place the 4 pieces of chicken breasts in a zip-top bag or shallow dish and pour the marinade over the chicken. Ensure each piece is well-coated, then seal the bag or cover the dish. Refrigerate for at least 1 hour, but ideally 4-6 hours for maximum flavor.
Preheat the Grill: About 15-20 minutes before grilling, preheat your grill to medium-high heat (around 375°F to 450°F).
Grill the Chicken: Remove the chicken from the marinade, allowing excess marinade to drip off. Place the chicken on the grill. Cook for about 6-8 minutes on each side or until the chicken is cooked through and has nice grill marks (internal temperature should reach 165°F).
Rest and Serve: Once done, remove the chicken from the grill and let it rest for about 5 minutes. This helps the juices redistribute for a more tender bite. Slice and serve warm.