Preheat your oven to 350°F (175°C) and line two baking sheets with parchment paper.
In a large mixing bowl, beat the softened butter, brown sugar, and granulated sugar together until creamy and light, about 2-3 minutes.
Add in the eggs one at a time, mixing well after each addition. Then stir in the vanilla extract until fully combined.
In a separate bowl, whisk together the flour, baking soda, and salt. Gradually add the dry ingredients to the butter mixture, mixing until just combined.
Gently fold in the mini chocolate chips until evenly distributed throughout the dough.
Using a cookie scoop or tablespoon, drop rounded balls of dough onto the prepared baking sheets, leaving a few inches between them as they will spread while baking.
Bake in preheated oven for 8-10 minutes or until the edges are lightly golden but the centers are still soft. Remove from the oven and let cool on the baking sheets for a few minutes before transferring them to wire racks to cool completely.
Once cookies are completely cool, take one cookie and place a generous scoop of vanilla ice cream on the flat side. Top with another cookie, flat side down, and gently press together.
If desired, sprinkle a small pinch of sea salt flakes on the ice cream before adding the top cookie for an extra flavor boost.
Place assembled sandwiches on a tray and freeze for at least 30 minutes to firm up.
Notes
For best results, freeze the sandwiches for at least 30 minutes before serving.