Then, in a deep dish, add your boneless, skinless chicken breasts. Season both sides of chicken breasts with 1 bowl of your seasoning. Then set it aside.
In your crock pot or slow cooker, add 1 cup of salsa verde at the bottom. Then add in your seasoning chicken breasts on top. Turn it on low for 3 hours.
Add your Greek yogurt, mayo, buttermilk, and second bowl of seasoning to an airtight container, whisk together, cover with a lid, and refrigerate until the tacos are ready.