In a large mixing bowl, add eggs, oil and mix until smooth.
Add chocolate cake mix and mix until combined.
Stir in Reeses pieces until evenly distributed.
Cover bowl and chill cookie dough in the fridge for 20 minutes to make it easier to handle.
Scoop out small portions of the dough and make little balls.
Place them on a cookie tray, lined with parchment paper.
Bake at 350 degrees for 10-12 minutes or until the edges are firm but center is slightly soft.
For better presentation, push a few more Reeses pieces candies on top of the cookies before they cool completely. Enjoy immediately or make cookie sandwiches.
For cookie sandwiches, allow cookies to cool completely and then, flip half the cookies and use a spatula to frost them with buttercream icing. Cover with remaining cookies and press gently. Stick mini Reeses peanut butter cups and Reeses pieces along the sides and enjoy!
Read all my tips above.
Unfrosted cookies can be stored in a sealed container at room temperature for up to 3 days and in the fridge for up to 5 days. Frosted cookie sandwiches must be stored in the fridge for up to 5 days.