EXCLUSIVE

Bobby Flay is more than happy to pay his soon to be ex-wife Stephanie March ﻿spousal support ... thing is, she says it's chump change so she's fighting him.

As TMZ reported the divorcing couple signed a prenup when they married in 2005. Sources connected with the couple and familiar with the situation tell TMZ ... the prenup provides Stephanie gets $5,000 a month for 5 years.

We're told the "Law and Order: SVU" star is incredulous because her camp believes Bobby's net worth is north of $20 million, and Stephanie believes she was an important part of his success.

And there's something even more galling to Stephanie. We're told the prenup provides Bobby -- who filed for divorce Friday -- the marital house, valued at around $8 million. The prenup only requires Bobby to pay her $1 million to buy her out of the house. She also gets $50k so she can pack up her stuff and move.