In the small bowl, combine the butter, minced garlic, parsley and salt. Then set aside.
Since you need to roll the chicken breasts, rolling them out makes them much easier to work with. To do this, lay the chicken breast on a cutting board or other flat surface.
Cover it with a piece of parchment or wax paper.
Then use a meat mallet or rolling pin to pound the chicken until it is a uniform thickness of about 1/4".
Remove the wax paper.
Spread a layer of the butter mixture over the chicken.
Roll up the chicken starting from the smallest end.
Use a couple of toothpicks to hold the ends closed.
Add a little more of the butter mixture to the top...this will help it brown on the top.