Combine ingredients: In a bowl, whisk together the peach preserves, bourbon, olive oil, soy sauce, apple cider vinegar, Dijon mustard, minced garlic, kosher salt, black pepper, and red pepper flakes.

Marinate salmon: Place the salmon filets in a shallow dish and pour the marinade over the top, ensuring they're well-coated. Cover and refrigerate for at least 30 minutes.

Preheat your grill: Get your grill or oven preheated to medium-high heat.

Prepare salmon for cooking: Remove the salmon from the marinade and let any excess drip off. Place it directly on the grill or in a baking dish.

Cook the salmon: Grill each side of the salmon for about 5-7 minutes or until it flakes easily with a fork.

Add peaches: In the last few minutes of cooking, toss the thinly sliced peaches onto the grill or into the baking dish with the salmon.

Serve and garnish: Once the salmon is done, plate it up and sprinkle with freshly chopped parsley.