For dough: Heat oven to 325°. Beat first 5 ingredients in a large bowl with mixer until blended. On low speed, beat in next 3 ingredients until blended. Drop rounded measuring teaspoons of dough 2 inches apart onto the prepared baking sheet(s). Bake 8 to 10 minutes until bottoms are light golden. Remove cookies to a wire rack to cool.
For glaze: Mix all of the ingredients together to make a smooth consistency. Dip tops of cooled cookies in glaze and, while wet, sprinkle with nonpareils. Let set.