The league reposted about the Phillies slugger's videos, that are getting millions of views on TikTok.
Harper used the hashtag "#BaristaBryce" as he made coffee drinks.
He was even decked out in Eagles gear on Sunday.
The 32-year-old, who has three children with his wife Kayla, showed off his banana bread recipe in another video.
Even Harper seems to be surprised by his off-season kitchen vlogging. When one person commented: "Not in a million years would I have ever guessed that I'd open TikTok to a Bryce Harper latte video," the all-star responded, "Same man. Same."