Marbled Mashed Potato Casserole

In a 3 or 4 quart saucepan, place sweet potatoes, 1/2 teaspoon salt, and enough water to cover. Heat to boiling over high heat.

Reduce heat to low, cover and simmer for 10 minutes or until potatoes are fork-tender. Reserve 1/4 cup sweet potato cooking water. Drain potatoes.

Meanwhile, in another 3 or 4 quart saucepan, place all-purpose potatoes, 1/2 teaspoon salt, and enough water to cover. Heat to boiling over high heat.

Reduce heat to low, cover and simmer for 10 minutes or until potatoes are fork-tender. Reserve 1/3 cup potato cooking water. Drain potatoes.

In a large bowl with mixer at medium speed, beat hot all-purpose potatoes, half of cream cheese, 3/4 teaspoon salt, half of the pepper, and reserved 1/3 cup potato cooking water until smooth.

In another large bowl, with mixer at medium speed, beat hot sweet potatoes, remaining cream cheese, 3/4 teaspoon salt, remaining pepper, and reserved 1/4 cup sweet potato cooking water until smooth.

In a shallow 2 1/2 quart microwave or oven safe baking dish, alternately dollop sweet potato mixture and all-purpose potato mixture by cupfuls into baking dish. With tip of a knife, cut and twist through mixtures to create marble design.

Bake in preheated 350 degrees F oven covered for 40 minutes or until hot. Or heat, covered in microwave oven on highm for 8 minutes or until hot.