In a small saucepan, melt together butter and chocolate chips. In a medium mixing bowl, whisk together eggs, sugar and vanilla. Add in slightly cooled butter and chocolate mixture and mix until well combined.
Add in flour, baking powder and salt and stir until just combined. Chill mixture in refrigerator for at least 30 minutes.
Using a cookie scoop, place cookie dough on a baking sheet lined with parchment paper about 1 ½ inches apart. Bake at 350F for about 10-12 minutes or until cookies are shiny and slightly cracked on top. Let cool completely on baking sheets before removing.