Preheat your oven to 350°F (175°C) and line a baking sheet with parchment paper., In a large bowl, mix together the flaked salmon, cooked brown rice, rolled oats, chopped spinach, and egg until fully combined., Add fish oil for an extra boost of omega-3, if desired., Shape the mixture into small patties and place them on the baking sheet., Bake for 20 minutes or until the patties are firm and slightly crispy on the outside., Let the patties cool completely before serving. Refrigerate for up to 3 days.