Marbled Mashed Potatoes

Yield: 10 Servings
Categories:
4Medium-size sweet potatoes
3/4cButter or margarine; divided
1tsGround cardamom
6Medium-size yukon gold potatoes; peeled and quartered
1/2cSour cream
1tsDried thyme
1tsSalt
1/2tsPepper
1/4cMilk; up to 1/2
Garnish: fresh thyme sprigs
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