Loaded Potato Bites

Preheat oven to 425 degrees with racks in upper and lower thirds. Place potatoes in a saucepan; cover with 2 inches of cold water. Season generously with salt and bring to a boil, then reduce heat to a simmer and cook until a knife pierces potatoes easily, 10 to 12 minutes. Drain; let cool 10 minutes.

Drizzle each of 2 rimmed baking sheets with 2 tablespoons oil. Arrange potatoes on sheets, tossing to coat; lightly crush each with the heel of your hand or back of a spatula to about 1/2 inch thick. Season with salt and pepper; roast, flipping halfway through, until golden and crisp, 30 to 35 minutes. Use immediately.

Meanwhile, in a medium bowl, combine sour cream, cheese, scallions, and bacon; season with salt and pepper. Top each potato with 1 to 2 teaspoons sour-cream mixture. Garnish with more scallions.