Copycat Lofthouse Cookies

Ingredients

• COOKIES:
• 6 cups plus 1/4 cup all-purpose flour, divided
• 1 teaspoon baking powder
• 1 teaspoon baking soda
• 1/2 teaspoon salt
• 1 cup butter, softened
• 2 cups sugar
• 3 large eggs, room temperature
• 1 teaspoon vanilla extract
• 1-1/2 cups sour cream
• FROSTING:
• 4 cups confectioners' sugar
• 1/8 teaspoon salt
• 4 tablespoons heavy whipping cream
• 2 to 4 drops food coloring, optional
• 2 tablespoons sprinkles, optional