Line a large baking sheet with foil. Lay another large piece of foil on top, and spray with nonstick cooking spray. Place salmon on top of foil.
In small bowl, mix melted butter, lime juice, honey, garlic and cilantro. Pour mixture over salmon. Fold sides of foil up over the salmon, and tent with an additional piece of foil to cover completely.
Bake for 20 minutes. Remove top foil and switch oven to broil. Broil salmon for 5-10 minutes, until salmon is golden brown and caramelized. Remove from oven and top with additional chopped cilantro, lime slices and Sriracha sauce, if desired.