Add the melted butter and both sugars into a large bowl. Stir well to combine.
Add in the peanut butter and mix well until thoroughly combined.
Stir in the vanilla and heavy cream.
Beat in the flour mixture and mix until just combined.
Fold in your mix-ins.
Video
Notes
Use heat-treated flour that's been cooled and sifted.
The exact amount of heavy cream will depend on how soft you like your cookie dough.
You cannot use this recipe to make baked peanut butter cookies as it does not contain any leavener or egg. It will simply become gooey like an underbaked peanut butter blondie.