Preheat oven to 275˚F. Line a rimmed baking sheet with parchment paper.
Place salmon filet on prepared baking sheet and brush with olive oil. Season with salt and pepper.
Bake skin-side down 25-35 minutes, until salmon is slightly opaque and there is no resistance when pierced with the tip of a knife. Remove from oven and let stand 5 minutes.
While salmon rests, melt butter in a small skillet over medium heat. Stir in capers and lemon juice. Remove from heat.
Transfer salmon to serving platter and drizzle with melted butter mixture and sprinkle with chives and parsley. Arrange lemon wedges on platter if desired and serve.