Preheat oven to 375°.
Season salmon fillets with salt and pepper and set aside.
In an ovenproof skillet whisk curry paste into coconut milk over medium heat until fully combined. Add in lime juice, ginger, fish sauce and brown sugar along with onions and peppers. Allow to simmer for 5 minutes stirring occasionally.
Set prepared salmon into the curry mixture and transfer pan to oven. Allow to cook for 10-12 minutes until salmon is just cooked through.
Serve over cauliflower rice topped with cilantro and green onions.