Preheat oven to 400°. Remove the skin on the salmon, wash, and cut into fillets. I like to cut the thicker pieces in half.
Using parchment paper or tin foil on a large baking dish, spread out fillets and season with lemon pepper, garlic powder, and salt.
In a bowl, whisk together the soy sauce, brown sugar, water, and olive oil. Drizzle on top of the fish.
Bake for 12-15 minutes depending on the thickness of the fillets. Alternatively, you could coat the fish in a bag with the marinade and then place them on a preheated grill, and discard marinade. Grill for 6 to 8 minutes on each side.
When ready, remove from oven and spoon the marinade on top of the salmon.