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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 nonstick spray coating.
Transfer sweet potato mixture to casserole.
Combine raisins, sugar, and cinnamon; sprinkle over top of sweet potato mixture.
Bake for 45-50 minutes, or until a knife inserted near center comes out clean.
