“Butter?” Fat chance.

A Long Island woman is suing a vegan “butter” maker, claiming its product is not similar enough to the real thing to call it butter.

Jasmine Brown of Suffolk County filed suit in Brooklyn federal court against Miyoko’s Kitchen Inc., a company that manufactures “cultured vegan butter.’’

Brown’s lawsuit charges that Miyoko’s packaging is “misleading because … the products lack any milk or dairy ingredients” and they also don’t have the nutritional and sensory “attributes which consumers associate with butter.”

The vegan butter “basks in dairy’s ‘halo’ by using familiar terms to invoke positive traits,” the suit says.

Meanwhile, consumers pay “a premium price” of at least $6.99 for the butter substitute, which they would expect “to resemble butter” but are instead “deceived” by the product, the suit claims.

Brown “paid this premium because prior to purchase, [she] saw and relied on the misleading representations,” the suit says.

The potential class-action lawsuit is seeking at least $5 million in damages for alleged negligent misrepresentation, breach of warranty, fraud and unjust enrichment.

Miyoko’s Kitchen is a Sonoma, Calif.-based company owned by celebrity chef Miyoko Schinner.

“Several surveys indicate that consumers are not confused when they buy plant dairy, and buy these products specifically because they do not contain animal ingredients,” Schinner told The Post on Monday.

“In fact, whether or not we call our product ‘butter,’ most consumers will refer to it as such because that is how it looks, tastes and performs.

“While our award-winning butter may not have tasted like butter to Jasmine Brown, many people who taste it either comment, ‘Wow! It’s butter!’ or ‘Wow! It’s better than butter!’ ” she said.