Place salmon in a resealable bag and add lemon juice; marinate in the refrigerator for at least 1 hour.
3 (6 ounce) salmon fillets, ¼ cup lemon juice
Preheat oven to 400 degrees F (200 degrees C). Line a baking dish with aluminum foil and spray foil with cooking spray.
Blend brown sugar, chili powder, lemon zest, oil, cumin, cinnamon, and salt together in a blender until brown sugar mixture is smooth.
¼ cup brown sugar, 2 tablespoons chili powder, 4 teaspoons lemon zest, 1 tablespoon vegetable oil, 1 ½ teaspoons ground cumin, 1 ¼ teaspoons ground cinnamon, 1 teaspoon salt
Remove salmon from bag and discard bag and lemon juice. Spread brown sugar mixture over salmon and place in the prepared baking dish.
3 (6 ounce) salmon fillets, ¼ cup lemon juice, ¼ cup brown sugar
Bake in the preheated oven until fish flakes easily with a fork, 12 to 15 minutes.