Preheat the oven to 425ºF. Oil a 9x13-inch glass baking pan with avocado oil. Season the fish generously with salt and pepper and place it onto the oiled pan.
Combine the coconut milk, cilantro, green onions, ginger, garlic, jalapeño, soy sauce, garam masala, salt and pepper in a blender and blend until smooth. Pour the mixture over the fish.
Bake until the fish flakes when tested with a fork, about 15 minutes.