These duchess potatoes are lower in calories and fat than the traditional version. The secret? Replacing butter with yogurt, heavy cream with skim milk, and half the potatoes with cauliflower. They're not as pretty, but they taste just as good!
Preheat oven to 400 degrees. Spray a rimmed baking sheet with cooking spray or oil mister.
Steam potatoes and cauliflower in a steamer basket over a few inches of boiling water for about 20 minutes, or until easily pierced with fork. Transfer to large bowl and mash thoroughly--if you're piping these, it's important to make sure the potato and cauliflower mixture is completely lump-free! It's best to use a potato ricer if you have one.
Add cheese, egg, milk, yogurt, salt and pepper to potatoes and cauliflower. Use a hand mixer on low speed to combine ingredients; fold in chives.
Transfer mashed potato mixture to piping bag or a large plastic zip-top bag. Since the potatoes will lose their shape anyway, it's best just to use a large round tip. If you're using a plastic bag, cut off the corner and pipe the potatoes through that. I piped in a spiral, starting from the outer-edge and working my way towards the center moving clockwise, but again, since these end up flattening out a little, it doesn't matter too much how you do it.
Spray tops of potatoes with oil mister or cooking spray. Bake for 15 minutes, then turn on broiler and broil for about 5 minutes or until edges begin to brown.
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