1. 1. Preheat the oven to 350°F (175°C).

2. 2. Cook the spaghetti according to package instructions until al dente. Drain and set aside.

3. 3. In a saucepan, combine the alfredo sauce, whole milk, and American cheese. Cook over low heat until the cheese is melted and the sauce is smooth.

4. 4. In a bowl, whisk together eggs, pineapple juice, and granulated sugar. Add this mixture to the cooked spaghetti and toss to combine.

5. 5. Pour half of the spaghetti mixture into a greased baking dish.

6. 6. Sprinkle rolled oats over the spaghetti layer.

7. 7. Top with the remaining spaghetti mixture.

8. 8. In a separate bowl, mix self-rising flour and melted butter until crumbly. Sprinkle this over the top of the casserole.

9. 9. Bake in the preheated oven for 25-30 minutes or until the top is golden brown and bubbly.

10. 10. Serve hot and enjoy!