Preheat oven to 425oF (218oC) and line a baking sheet with parchment paper. Combine tuna, mashed sweet potato, flour, green onion, egg, oregano, paprika, sea salt and black pepper together in a bowl. Mix well. Use your hands to form into even cakes. Drop the cakes onto one side of the baking sheet. Place in the oven and set your timer for 15 minutes.