01 -
Preheat the oven to 400°F (200°C).
02 -
Pour the orange juice into a shallow dish and add the salmon fillets, skin-side up. Let the salmon stand at room temperature for 15 minutes to marinate.
03 -
In a small bowl, mix the brown sugar, granulated sugar, baking cocoa, cayenne pepper, ground cinnamon, salt, and pepper.
04 -
Remove the salmon from the orange juice and place it skin-side down on a parchment-lined baking sheet.
05 -
Rub each fillet with the cocoa spice mixture, then top with a slice of orange.
06 -
Brush the salmon with melted butter to add moisture and flavor.
07 -
Bake in the preheated oven for 20-25 minutes or until the salmon flakes easily with a fork.
08 -
Serve warm.