Set your oven to 350°F (175°C).
This ensures even baking.
Line your baking sheet with parchment paper.
Add cake mix to your bowl.
Crack in the eggs. Pour in the oil.
Add vanilla if using.
Mix everything until well combined.
The dough will be slightly sticky.
Scoop about 1 tablespoon of dough.
Roll it into a ball. If desired, roll in powdered sugar.
This makes them look fancy.
Place balls on the baking sheet.
Leave 2 inches between each cookie.
Put the sheet in the oven. Bake for 10-12 minutes.
Cookies should be set but still soft.
Don't overbake them. They'll firm up as they cool.
Let cookies cool on the sheet for 5 minutes.
Then move them to a cooling rack.
Wait until completely cool before eating.