Marinate both fillets in around a half a cup of teriyaki sauce, making sure the salmon is covered in the sauce. I like to marinate the salmon the night before in the fridge as it gives the salmon a dark color and rich flavor. If you don't have that much time, marinating for 20 minutes in the fridge will also work.
Heat the oil on the skillet on medium heat.
Once the skillet is hot, add salmon fillets to the pan skin side down and cook for 3-4 minutes before flipping. To get a good sear, try not to move the salmon before it's ready to flip.
While the salmon is cooking, lightly season with salt and pepper.
After 3-4 minutes, flip salmon and cook for an additional 2-3 minutes or until the salmon is almost fully cooked.
After 2-3 minutes, flip the salmon again and cover with 1/4 of a cup of teriyaki sauce. Cook the salmon in the teriyaki sauce until it thickens and coats the salmon (around 1 minute). Use a spoon to continually baste the teriyaki sauce over the salmon while cooking.
Garnish with white sesame seeds, serve, and enjoy!