For replacing the Sweet Potatoes I found this recipe

Savory Pumpkin-Nut Bake
Atkins Kitchen
You'll never miss sweet potatoes with this savory-sweet side dish.

12 large eggs, beaten
2 cups canned pumpkin
1/4 teaspoon nutmeg
1/4 teaspoon allspice
1/2 teaspoon salt
8 ounces mascarpone cheese, lightly whipped*
1/2 cup Atkins Sugar Free Pancake Syrup
1/4 cup pecans, chopped
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1. In a mixer on high speed, whip eggs five minutes until thick.
2. Heat oven to 350°. In a large bowl, whisk pumpkin until smooth; gradually whisk in eggs, nutmeg, allspice, salt, mascarpone and syrup. Pour mixture into a buttered 9-inch x 13-inch baking pan. Bake 45 minutes.
3. Sprinkle chopped pecans evenly over top; bake 15 minutes more. Cool slightly before cutting.
* or 4 ounces softened cream cheese mixed with 1/2 cup cream.