Poke each potato a few times with a fork. Place on microwave safe plate. Place a paper towel over potatoes. Microwave on HIGH 2 minutes. Turn potatoes over and microwave on HIGH additional 2 minutes, or until tender. Remove from microwave and let cool.
Cut potatoes in half width-wise and toss in olive oil, garlic powder, salt and pepper. Place skin-side-up on parchment-lined baking sheet. Gently press down each potato with a potato masher until about ½-inch thick.
Bake 30 minutes, turning potatoes halfway through cooking, until potatoes are browned.
Let cool slightly before topping with yogurt and chives.