Preheat the oven to 400° Fahrenheit and drizzle a bit of oil into the bottom of a baking dish.
Place the salmon filets skin-down into a baking dish. Pat the tops of the salmon filets with a paper towel, Sprinkle each filet with a bit of salt and pepper.
In a small bowl, combine the orange juice, zest, harissa, honey, and garlic. Whisk to combine.
Spoon the orange mixture evenly over the salmon filets.
Bake in the preheated oven for 15-18 minutes, until the thickest part of the filets are opaque and flake easily. They should register at least 135° with a meat thermometer.
Remove from the oven and cover them with a bit of aluminum foil. Let the filets rest for 5 minutes. This helps the juices settle and allows the internal temperature to reach 145° without the risk of over baking.
Serve salmon immediately. Store leftovers in an airtight container in the fridge for up to 3 days.