My Soft sugar cookies recipe CloudLike Buttercream

Ingredients

• 1 cup (2 sticks, 227g) unsalted butter, softened
• ¾ cup (150g) granulated sugar
• ¾ cup (150g) powdered sugar (icing sugar)
• 2 large eggs
• 1 teaspoon (5ml) vanilla extract
• 2 ½ cups (300g) all-purpose flour
• 1 teaspoon (5ml) baking soda
• 1 teaspoon (5ml) cream of tartar
• ½ teaspoon (3g) salt
• 1 cup (2 sticks, 227g) unsalted butter, softened (for frosting)
• 3-4 cups (360-480g) powdered sugar (icing sugar), sifted (for frosting)
• ¼ cup (60ml) heavy cream (double cream) (for frosting)
• 2 teaspoons (10ml) vanilla extract (for frosting)
• Pinch of salt (for frosting)