Gather all ingredients.

Stir maple syrup, soy sauce, garlic, garlic salt, and pepper together in a small bowl.

Cut salmon into 4 equal-sized fillets; place in a shallow glass baking dish and coat with maple syrup mixture. Cover the dish and marinate salmon in the refrigerator for 30 minutes, turning once halfway.

Preheat the oven to 400 degrees F (200 degrees C).

Place the baking dish in the preheated oven and bake salmon uncovered until flesh easily flakes with a fork, about 20 minutes.

Enjoy!