Heat oven to 375°. In a medium bowl,
whisk flour, baking soda and salt. Set aside.
In a large bowl, combine 1/2 cup of the
granulated sugar, the dark brown sugar,
butter and SunButter. Beat at medium
speed until light and fluffy. Add egg and
beat well. On low speed, beat in vanilla,
followed by flour mixture, scraping down
sides of bowl.
Place remaining 1/4 cup granulated sugar
in a small bowl. Shape dough into 1-inch
balls, roll in sugar and place 2 inches apart
on baking sheets. Bake at 375° for 8 to
10 minutes. Immediately press a Kiss into
each cookie. Transfer cookies to a wire
rack and cool completely.