Whip butter until soft. Add eggs, brown sugar, and vanilla. Beat until smooth.
Add salt, baking powder, flour, and chocolate chips.
Scoop onto parchment-paper-lined baking sheets (6 cookies per sheet).
For regular-sized cookies (2 Tbsp.), bake at 350 degrees for 12-13 minutes. For larger (3 Tbsp.) cookies, bake at 350 degrees for 14-15 minutes.
Let cookies cool completely on baking sheets.
Video
Notes
Chill dough or add a bit more flour (optional): I noticed right away that the recipe called for 2 cups (1 pound) of butter and only 4 cups of flour. Most recipes would call for 2 ¼-2 ½ cups of flour for that amount of butter, but I made them as written anyway. The cookies, as predicted, spread a little more than I wanted. The recipe does not state whether or not they chill the dough for the cookies served at the hotel. I'd imagine they do. I found that for a no-chill version, adding an extra ⅔ cup of flour is the sweet spot. That small adjustment helps the cookies keep their shape while still giving you the soft, chewy center. You can also make the cookies with the original amount of flour and chill the scooped dough for 1-2 hours before baking.