These homemade chocolate chip cookie sandwiches take two golden chocolate chip cookies and fill them with a rich buttercream filling. The perfect combination of soft cookies and a creamy filling!
Whisk together the flour, cornstarch, baking soda, and salt in a medium bowl. Set aside.
Using an electric mixer on medium speed, beat the butter, brown sugar, and granulated sugar until light and fluffy. Add the eggs and vanilla, and then mix until combined.
Gradually add the flour mixture, and mix just until incorporated. Fold in the chocolate chips.
Cover and chill the cookie dough for 1 hour.
Preheat oven to 350°F (175°C). Line baking sheets with parchment paper or silicone liners.
Scoop heaping tablespoons of the dough and roll it into balls. Place the cookies 2 inches apart on the prepared pan.
Bake one pan at a time for 9-11 minutes, or until the edges have begun to brown. (Do not over-bake for soft, chewy cookies.)
Place the pans on wire racks and allow to cool for 5 minutes. Then transfer the cookies from the pans directly onto a wire rack to allow them to cool completely.
To make the filling:
Using an electric mixer with a whisk attachment, beat the butter and shortening on medium speed until light and fluffy.
Reduce the speed to low and gradually add the confectioners’ sugar, mixing until combined.
Next, add the vanilla and water, and mix on medium-high for 10 minutes. The filling will be light and fluffy.
Spread or pipe the filling onto the bottoms of half of the cookies. Top with the other half of the cookies to form sandwiches.
Notes
Store the assembled cookies in an airtight container in the refrigerator up to 5 days. Bring to room temperature for serving.