Creamy Wow Butter Sandwich Cookies

Ingredients

• 1.5 cups wow butter
• 1 cup packed light brown sugar
• 1/2 cup softened unsalted butter or vegan baking stick
• 2 heaping tablespoons cornstarch mixed with 3 tablespoons water
• 1.5 cups gluten free flour
• 1 teaspoon baking powder
• 1/4 cup nut-free plant milk
• 1/3 cup granulated sugar for rolling (more if needed)
• 1/2 stick softened unsalted butter or vegan baking stick
• 3/4 cup room temperature wow butter
• 1/4 cup confectioners' sugar
• 1/2 teaspoon coarse salt
• 1 cup semi-sweet chocolate chips
• 4 tablespoons unsalted butter or vegan baking stick