Heat a cast iron skillet over medium-high heat. Drizzle 1 tablespoon avocado oil into the skillet.
Season the 4 salmon filets with ¼ teaspoon salt and ¼ teaspoon pepper.
Place the salmon filets in the hot skillet and cook for 4-5 minutes per side, or until the salmon reaches an internal temperature of at least 145°F.
While the salmon cooks, whisk together 2 tablespoons brown sugar, ¼ cup low sodium soy sauce, 2 tablespoons rice vinegar, 2 tablespoons honey, ¼ teaspoon minced garlic, ¼ teaspoon ground ginger, and 2 teaspoons cornstarch in a small saucepan.
Heat the saucepan over medium-high heat, whisking constantly until the sauce is heated through and has thickened.
Remove the salmon from the skillet and spoon the teriyaki sauce evenly over the salmon.
Sprinkle with 2 tablespoons sesame seeds and the 2 diced green onions before serving.
Serve immediately and enjoy!
Notes
Refrigerate the leftovers in an airtight container for up to 3 days. We use an instant-read meat thermometer to make sure that the salmon is cooked to a safe temperature.