05In small bowl, beat eggs with fork; beat in buttermilk and butter.
06Add to flour mixture; stir just until blended.
07Fill greased pans 2/3 full.
08Sprinkle with Streusel Topping.
09Bake in preheated 400 degrees oven until pick inserted in center comes out clean, 15 to 25 minutes for muffins, 30 to 35 minutes for 9-inch square coffee cake.