Preheat oven to 350 degrees and line two baking sheets with parchment paper or Silpats.
In a stand mixer or in a bowl with hand mixer, cream together butter, granulated sugar, and brown sugar until light and fluffy, 3-4 minutes.
Mix in egg and vanilla until just combined.
With the mixer on low, blend in pancake mix until just combined, taking care not to over-mix. Fold in chocolate chips.
Place bowl in fridge to let cookie dough chill for about 30 minutes.
Scoop about 3 Tbsp cookie dough (I use a #20 cookie scoop) onto prepared cookie sheets, about two inches apart. Cookies will spread a bit.
Bake for 10-12 minutes, until cookies are just turning golden around edges. Let cool in pan for a couple minutes before moving to wire racks to cool completely.