Microwave 1 1/2 pounds small Yukon Gold potatoes, turning halfway through, until tender, 10 to 12 minutes; let cool slightly. Break into chunks. Toss with 2 tablespoons olive oil, 2 smashed garlic cloves, 3/4 teaspoon kosher salt and a few grinds of pepper. Roast on a baking sheet at 450 degrees F, stirring once, until browned and crisp, about 30 minutes. Sprinkle with shredded sharp cheddar and chopped chives.