1. Tuna: Cats can enjoy fresh, properly cooked tuna in moderation. It is a good source of protein and omega-3 fatty acids.
2. Chicken: Cooked chicken without any seasoning or bones can be a tasty and safe treat for cats. It's an excellent source of lean protein.
3. Pumpkin: Plain, cooked pumpkin is beneficial for cats. It can help with digestion and provide extra fiber in their diet.
4. Blueberries: These antioxidant-rich fruits can be given as an occasional treat to cats. They are low in calories and packed with vitamins.
5. Carrots: Cooked carrots are safe for cats and can provide them with vitamins and fiber. However, they should be given in small, bite-sized pieces.
6. Spinach: Small amounts of cooked spinach can be a nutritious addition to a cat's diet. It is rich in vitamins and minerals.
7. Salmon: Cooked salmon is safe for cats and a great source of omega-3 fatty acids. However, it should always be boneless and served in moderation.
8. Watermelon: Cats can enjoy small amounts of ripe, seedless watermelon. It is hydrating and contains vitamins A and C.
9. Cantaloupe: Like watermelon, cats can have a small amount of ripe, seedless cantaloupe. It is a good source of vitamins and minerals.
10. Cooked Eggs: Plain, cooked eggs can be a protein-rich treat for cats. Ensure they are fully cooked and do not add any seasoning.

Please note: While these foods are generally safe for cats, it's important to introduce them gradually and in moderation. Every cat is unique, so it's best to consult with a veterinarian before making any significant changes to your cat's diet.

References:
1. "Human Foods That Are Safe for Cats" - American Society for the Prevention of Cruelty to Animals (ASPCA)
2. "Human Foods and Cats: What's Safe and What's Not" - The Humane Society of the United States