Preheat your oven to 200°C / 180°C fan / 400°F.
Line a large baking tray with aluminium foil and baking paper.
Place the salmon skin side down on the tray.
Season with salt and pepper and a light brush of olive oil if using, or spread your chosen flavour addition over the top.
Roast for 20-25 minutes until the flesh flakes easily when pressed gently at the thickest part.
Remove from the oven and leave to cool slightly.
Portion into freezer bags for the plain version. For the sauced versions freeze flat on a tray before transferring to freezer bags once solid.