In large bowl, mix 2 cups of the flour, the sugar, salt and yeast. In 1-quart saucepan, heat water, milk and 1/2 cup butter until very warm (120°F to 130°F). Beat warm liquid and egg into flour mixture with electric mixer on low speed until moistened, scraping bowl frequently. Beat on medium speed 3 minutes, scraping bowl frequently. With spoon, stir in 2 1/2 to 3 cups of the flour until dough pulls cleanly away from side of bowl.