- In medium bowl, stir together sweet potato and banana.
- Add milk, blending well.
- Add brown sugar, egg yolks, and salt, mixing thoroughly.
- Spray 1-quart casserole with nonstick cooking spray.
- Transfer sweet potato mixture to casserole dish.
- Combine raisins, sugar, and cinnamon.
- Sprinkle over top of sweet potato mixture.
- Bake in preheated 325º F oven for 40-45 minutes, or until knife inserted near center comes out clean.