Peel potatoes, and cut into 1-inch pieces. Bring potatoes, 1 tsp. salt, and cold water to cover to a boil in a medium-size Dutch oven over medium-high heat. Reduce heat to medium-low, and cook 16 to 20 minutes or until fork-tender; drain.
Return potatoes to Dutch oven. Cook until water evaporates and potatoes look dry. Mound potatoes on 1 side; add butter, next 3 ingredients, and remaining 1 tsp. salt to opposite side of Dutch oven. Cook 1 to 2 minutes or until butter is melted and mixture boils.
“An electric mixer creates slightly chunkier potatoes, so everyone knows they’re homemade,” says Lyda Jones Burnette, Test Kitchen Director. “Beat the potatoes just a few seconds beyond the point where they release from the beaters.”