Empty cake mix into a medium sized bowl and add the butter and vanilla.
In another bowl, combine the eggs and give them a quick whisk with a fork to break the yolks.
Add the eggs to the cake mixture and combine well.
Spoon out the cookies onto a parchment lined baking sheet.
Using a fork, flatten the cookies slightly.
Bake for approximately 10 – 12 minutes.
When cookies come out of the oven, quickly sprinkle the toffee bits on the top and push them slightly into the cookie while it’s still soft. Let cool in the pan for 5 minutes before transferring them onto a cooling rack.