Combine the butter, garlic, parsley, and olive oil in a small pot and heat on medium low, stirring regularly until the butter is completely melted and the everything is combined
Remove from the heat and let cool for a few minutes
Load the marinade into the turkey injector and begin injecting it into the bird. Start at the top of the breast and work your way down, injecting in multiple spots
Go slowly and press gently on the injector. If you force the marinade in too quickly it can shoot back out at you
As you inject the marinade, you’ll see the turkey inflate and plump up
When you’re finished, add whatever rubs or seasonings you want to the bird and it’s ready to cook!