The Peanut-Butter Sparkle Time Hair is a hat that can be found on the first floor of the Clothing Store and purchased for only 32 Bucks. Purchasing this hat will allow you to wear it only in Adopt Me!, unless you purchase it for Robux from the Roblox Catalog.
The description of this item on the Roblox Catalog is:

It's peanut butter sparkle time! Peanut butter sparkle
time. Peanut butter sparkle with a baseball bat. Now where you at. Where you at.