- In a medium bowl, stir together sweet potato and banana. Add milk, blending well.
- Add brown sugar, egg yolks, and salt, mixing thoroughly.
- Spray a 1-quart casserole with non-stick spray coating.
- Transfer sweet potato mixture to casserole.
- Combine raisins, granulated sugar, and cinnamon; sprinkle over top of sweet potato mixture.
- Bake in a preheated 300° F oven for 40 minutes