Step 1: Prepare the Honey Mustard Sauce
In a mixing bowl, whisk together Dijon mustard, honey, whole grain mustard (if using), olive oil, apple cider vinegar, garlic, paprika, salt, black pepper, and onion powder. Set aside.

Step 2: Prepare the Chicken
Pat the chicken breasts dry with a paper towel. If they are too thick, pound them slightly to even out the thickness for even cooking.

Step 3: Marinate the Chicken
Place the chicken in a bowl or resealable plastic bag and pour half of the honey mustard sauce over it. Let it marinate for at least 30 minutes (or up to 4 hours) in the refrigerator for maximum flavor.

Step 4: Cook the Chicken

• Baking Method: Preheat oven to 375°F (190°C). Place the marinated chicken in a baking dish, pour some extra marinade over the top, and bake for 25-30 minutes until fully cooked.
• Grilling Method: Preheat the grill to medium heat. Grill chicken for 6-7 minutes per side, basting occasionally with the reserved honey mustard sauce.
• Stovetop Method: Heat a large skillet over medium heat with a little olive oil. Cook the chicken for about 5-6 minutes per side, brushing with more sauce.

Step 5: Serve and Enjoy
Remove the chicken from the heat and let it rest for 5 minutes before serving. Garnish with fresh thyme leaves and drizzle with extra honey mustard sauce.