In a small bowl, whisk together the avocado oil, coconut sugar, red curry paste, salt, and garlic powder. Coat the salmon filets generously on all sides. Set aside.
Heat a large stainless steel sauté pan over medium-low heat. Add a drizzle of avocado oil, then place a piece of parchment paper large enough to cover the bottom of the pan. Drizzle a bit more oil on top of the parchment.
Place the salmon filets in the pan, skin side down. Cook for about 4 minutes, undisturbed, to create a crispy skin. Flip and cook for an additional 3 to 4 minutes, depending on the thickness of the filets. The salmon should be mostly cooked through. Remove from the pan and set aside.
Remove the parchment paper from the pan and add another drizzle of oil. Increase the heat to medium.
Add the diced onion and bell pepper to the pan, cooking for 4 to 5 minutes until softened. Add the minced garlic and ginger, cooking for 1 to 2 minutes until fragrant.
Whisk in the coconut milk, curry paste, fish sauce, and coconut sugar. Simmer for 6 to 8 minutes to allow the flavors to meld.
After 6 minutes, stir in the lime juice and cilantro. Taste and adjust seasoning with salt and pepper.
Nestle the salmon filets into the sauce, skin side up, ensuring the crispy skin stays above the sauce. Simmer for an additional 2 to 3 minutes to finish cooking the salmon without losing the crispy skin.
Serve the salmon and curry with cooked rice and garnish with chopped fresh cilantro, sliced scallions, and a squeeze of fresh lime.