Preheat your Traeger grill to 275°F.
Place the side of salmon skin-side down on a baking sheet and pat it dry.
Mix softened butter, shallot, chives, parsley, garlic powder, salt, and pepper in a small bowl.
Spread the butter mixture evenly over the top of the salmon.
Place the salmon on the grill, skin-side down. Insert the probe into the thickest part.
Grill for 35–40 minutes or until internal temperature reaches 130°F–135°F.
Remove from grill, rest briefly, and serve with lemon wedges if desired.
