Preheat oven to 350°. Line a large rimmed baking sheet with foil (line the foil with parchment to prevent any interaction of the lemon slices with the foil). In center of parchment, arrange lemon slices in an even layer.
Season salmon with salt and pepper and place on top of lemon slices.
In a small bowl, whisk garlic, butter, honey, thyme, and oregano until combined. Pour over salmon, then fold up parchment and foil around salmon.
Bake salmon until opaque, cooked through, and flesh easily flakes with a fork, about 25 minutes.
Heat broiler. Broil salmon, watching closely, until browned in spots, 4 to 6 minutes.
Top with parsley before serving.
