I could not find more than a notice on this (heavily restored) mosque, which has a medrese nearby:

Orucbey Kızı Sittihatun Camii 1459-1460.

The mosque is part of a small complex that was built in 1460, commissioned by Sitti Hatun, a daughter of Oruç Bey, the second son of Kara Timurtaş Paşa. The latter was grandson of Aygut Alp (a famous comrade of Osman Gazi, the namesake of the Ottoman dynasty) and was appointed ‘beylerbeyi’ (governor) by Murat I. His son Oruç Bey was the first known court historian of the Ottomans; his daughter Sitti Hatun became the first wife of Zağanos Mehmed Paşa, a life-long companion of Fatih Sultan Mehmet II, with an impressive career as tutor, army commander, Grand Vizier and Governor. No wonder his wife had some money to spend on community service.

The Sitti Hatun Mosque is also called ‘Kanberler Camii’ (Mosque of the Kamberler neighbourhood).
It has a square prayer hall (8,90 x 8,90 m), which is preceded on the north side by a porch, 8,90 m wide and 3,3 m deep (these are the inside dimensions; the outside measures 10,9 x 15,2 m).
The prayer hall is covered by a dome. It has been restored several times, last in 1956.

On the picture: The mosque as seen from the West, with the domed prayer hall on the right and the porch wit hits raised front on the left.
Such porches-with-raised-front, which are open on their north side only (and generally having three arches) are not uncommon in the Ottoman architecture of the 15th and 16th century; in Bursa alone, at least eight other middle-sized mosques have the same striking characteristic.
On the outer left side of the picture, in the background: a glimpse of the adjacent small medrese or ‘mektep’ (school), which is the second building of the Sitti Hatun complex.

Correspondent: J.M.Criel, Antwerpen.
Sources: ‘Vakıf Abideler ve eski Eserler (volume III)’ - Vakıflar Genel Müdürlüğü, Ankara 1983 & Wikipedia.