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Stir together maple syrup, soy sauce, minced garlic, garlic salt, and ground black pepper in a small bowl until well combined.
Cut the salmon into 4 equal-sized fillets and place them in a shallow glass baking dish.
Pour the maple mixture over the salmon, ensuring each piece is well coated. Cover and refrigerate for 30 minutes, turning the fillets halfway through.
Set the oven to 400°F (200°C).
Place the uncovered dish in the oven and bake for about 20 minutes, or until the salmon flakes easily with a fork.
Remove the salmon from the oven and serve warm.

