Not only are these homemade peanut butter cookies super quick and easy to make, they are exceptionally soft and delicious thanks to a simple box of yellow cake mix. I’ve been making my cookies like this for years, so I thought I’d go ahead and share the secret to making the softest peanut butter cookies, ever. If you're looking for simple desserts to make, these only require a few basic pantry staples. My kids love them!