Preheat oven to 350 F. I only made half of the recipe. Add butter to mixer.
Add sugars and mix until light and fluffy.
Should look like this. Sorry for the bad pic.
Add your egg, and vanilla
Add your flour, baking soda, and salt and mix until just combined.
Scrap the sides.
Add your Reese's pieces chocolate. And mix.
Put spoonfuls in baking sheet.
Put in oven and bake 10-13 mins. Until lightly golden