Line a broiler-safe sheet pan with parchment paper and preheat the oven to the broil setting on high heat.
Spread the peppers and onion onto the prepared baking sheet in an even layer, and then place the 4 fillets of salmon evenly, spreading the peppers and onions to make room for each fillet.
Add the lime juice, cilantro, olive oil, water, honey, salt, chili powder, cumin, and paprika to a small bowl and whisk well to combine. Mixing in the honey may take some work, but just continue to stir and it will come together. Alternatively, you could warm the honey first.
Pour the marinade over the vegetables and salmon in an even layer.
Toss the vegetables to coat them in the marinade, and flip the salmon fillets over to coat both sides with the mixture.
Place the baking sheet in the oven and cook for approximately 10 minutes, or until the salmon flakes easily and the peppers are beginning to char on the edges.
Remove from the oven and serve immediately with additional chopped cilantro and lime wedges (if desired).