Preheat oven to 350 degrees F. Line baking sheet with silicone baking mat or parchment paper.
Lightly cream butter and sugar.
Add eggs one at a time, mixing until incorporated.
Add vanilla, baking soda, and kosher salt.
Add flour and chocolate chips, mixing just until combined.
Refrigerate cookie dough for a half hour before portioning. Use a 1 oz cookie scoop or aim for balls that are about 2 Tbsp in size. Sprinkle with a bit of Maldon sea salt or flaky salt.
Bake at 350 degrees for 10-13 minutes, depending on your oven. The cookies will turn golden brown at the edges. They should still be slightly puffy in the middle, but starting to color in the middle as well.
Notes
Feves are larger chocolate disks that make for great layers of chocolate in the cookies, they also tend to be made with higher quality chocolate.