In a large skillet, melt Kerrygold Pure Irish Butter over medium heat. Add onion and cook, stirring frequently, for 10 minutes. Add apples to skillet; cook and stir for 10 minutes more or until onions and apples are very soft; set aside. Preheat oven to 450° F and line 2 large baking sheets with parchment paper. Divide dough into 3 equal pieces. Roll each into a 9-inch circle or a 10 x 8-inch rectangle on a lightly floured board. Transfer to prepared baking sheets and sprinkle with Kerrygold Blarney Castle Cheese. Place equal amounts of onion mixture, prosciutto and Kerrygold Dubliner® Cheese on each pizza. Bake for 12 to 15 minutes or until cheese is lightly browned on the edges. Sprinkle with fresh thyme.