cookies3/4 cup (1 1/2 stick) butter room temperature1 cup, packed imperial sugar light brown sugar 1 egg2 teaspoons vanilla3/4 teaspoon baking soda1/2 teaspoon salt2 cups all-purpose flour*praline frosting 4 tablespoons (1/2 stick) butter1 cup imperial sugar light brown sugar 1/4 cup heavy c