Brownie Sandwich Cookies are rich and fudgy in flavor. A soft and chewy brownie-like cookie is filled with a creamy coffee-flavored filling in these decadent treats. It's ideal for satisfying your sweet tooth! Ingredients: 1 cup 2 sticks unsalted butter, softened 1 cup granulated sugar 1 cup packed light brown sugar 2 large eggs 1 teaspoon vanilla extract 2 cups all-purpose flour 3/4 cup unsweetened cocoa powder 1 teaspoon baking soda 1/2 teaspoon salt 2 cups semisweet chocolate chips 1/2 cup chopped walnuts optional 1/2 cup confectioners' sugar 1/4 cup heavy cream 1 teaspoon instant coffee granules optional Instructions: Melt the butter and mix it with the white sugar and brown sugar in a large bowl until the mixture is light and fluffy One at a time, add the eggs and beat well after each one Add the vanilla extract and mix well All-purpose f...