Perfect Sandwich Cookies

Name: Perfect Sandwich Cookies
Prep time: 50 min
Cook time: 10 min
Total time: 1 h
Cuisine: American
Ingredients: 1 1/2 cups all-purpose flour*; 1 teaspoon baking powder; 6 tablespoons unsalted butter, soft; 1/2 cup Imperial Sugar Extra Fine Granulated Sugar; 1 large egg, at room temperature; 1/2 teaspoon salt; 2 teaspoons vanilla extract; 1/3 cup milk; 1 stick (8 tablespoons) unsalted butter, very soft; 1 1/2 cups Imperial Sugar Confectioners Powdered Sugar; Pinch salt; 1-2 tablespoons finely crushed freeze-dried fruit (optional), strawberries were used here; 1 tablespoon milk or half and half; Food color of choice (optional)