Cook potatoes in boiling salted water for about 8 minutes or until almost cooked through. Add apples and cook for 5 minutes more or until potatoes and apples are tender; drain well. While potatoes are cooking, heat oven to 400° F and lightly butter an 11 X 7-inch baking dish. In a large skillet, cook bacon over medium-high heat for about 5 minutes or until golden brown and crisp, stirring frequently. Remove with a slotted spoon, then remove all but 2 tablespoons of bacon fat; add Kerrygold Pure Irish Butter to skillet. When butter has melted, add potatoes and apples. Toss well to coat with butter; cook and stir for about 5 minutes over medium-high heat to lightly brown. Transfer to prepared baking dish and top with cooked bacon. Bake for 15 minutes. Sprinkle with chives, if desired.