Preheat oven to 350°F (175°C). Line baking sheets with parchment paper.
In a bowl, whisk together flour, baking soda, and salt.
In a separate bowl, beat together softened butter, granulated sugar, brown sugar, and vanilla until creamy. Add the egg and mix well.
Gradually blend in dry ingredients and fold in chocolate chips.
Drop rounded tablespoons of dough onto prepared sheets and bake for about 10 minutes until golden brown. Cool on wire racks.
For the filling, beat cream cheese with powdered sugar and vanilla until smooth.
Spread filling between two cooled cookies to form sandwiches.
