Start by heating a tablespoon of avocado oil in a skillet over medium-high heat. Sauté the chopped onion for about 5 minutes until soft, then add the garlic and cook for another 2–3 minutes until fragrant. Transfer this mixture to a blender with roasted red peppers, coconut milk, and salt, and blend until smooth. Set aside until ready to use.
Heat 2 tablespoons of avocado oil in a skillet over medium-high heat until it’s sizzling hot, around 400–500°F. Place the salmon fillets flesh-side down and cook for 6 minutes. Flip carefully using a spatula and cook for another 4 minutes or until the salmon reaches your desired doneness. Let the fillets rest for 10 minutes before serving.
Pour the red pepper sauce into a skillet and gently heat over medium heat. Add spinach and cherry tomatoes, stirring until the spinach wilts, about 2–3 minutes. Plate the salmon and spoon the sauce generously over each fillet. Serve with your favorite sides like rice, pasta, or crusty bread to soak up every drop of that creamy sauce.