Bring potatoes, 1 teaspoon salt, and water to cover to a boil in a Dutch oven; cook 30 minutes or until tender. Drain.
Return potatoes to Dutch oven. Add sweet potatoes and cream cheese; mash until smooth with a potato masher. Stir in bacon, next 3 ingredients, and remaining 2 teaspoons salt. Spoon mixture into a lightly greased 11- x 7-inch baking dish.
Bake, uncovered, at 350° for 20 minutes. Garnish, if desired.