The phrase "a favorite topic of" is correct and usable in written English.
You can use it when discussing subjects that are particularly liked or preferred by someone or a group.
Example: "Environmental conservation is a favorite topic of many students in our class."
Alternatives: "a preferred subject of" or "a beloved theme of".
When props go awry was a favorite topic of conversation.
His age, of course, is a favorite topic of conversation with friends.
But at whatever volume, contempt for conservative mores is a favorite topic of young Iranians.
Mr. Pataki's use of state-owned aircraft and chartered jets has become a favorite topic of his Democratic rivals.
The safety concerns surrounding such systems have placed a premium on research into technologies like speech recognition, a favorite topic of Mr. Gates's these days.
America's poor are actually living the good life". The network's role in playing up food-stamp shenanigans was a favorite topic of former "Daily Show" host Jon Stewart.
Commemorated in speeches, memorials, and school curricula as a precursor to the successful independence movement of the 1950s, its leaders and events are also a favorite topics of nationalist, social, and world historians.
Mr. Jarmusch's production company for this film is PointBlank, a reference to the 1967 John Boorman crime movie with Lee Marvin, and he has borrowed the title of "The Limits of Control" from a 1975 essay by William S. Burroughs, in which the writer analyzes a favorite topic: systems of control.
Elaborating on his rationale for creating the gallery, Mr. Büsser returned to a favorite topic: the mediocrity of 20th century watchmaking.
Trump has made immigration a favorite topic in advance of next week's midterm elections, and he said in an interview released Tuesday that advisers have told him that he has the power to end birthright citizenship.
A favorite topic: the national bird of Portugal, the walnut-sized Musca domestica (housefly), squadrons of which are even now dive-bombing us.
