17. Sufganiyot:^[1]

The before blessing of a deep fried, or jam filled, Sufganiya is Mezonos.

Blessing during meal:^[2] One is to recite the blessing of Mezonos upon eating a typical Sufganiya [deep fried and/or contains jam^[3]] during a meal, if he is eating it for pleasure purposes. If, however, one is eating it for purposes of satiation, then a blessing is not to be said. 

After blessing if ate large amount:^[4] Deep fried Sufganiyot retain the before and after blessing of Mezonos and Al Hamichya irrelevant of how much one eats. [However, baked Sufganiyot can become Hamotzi and require Birchas Hamazon if one eats over a certain amount, just as is the law by all Mezonos bread.] 

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[1] Seder Birchas Hanehnin 2:7 regarding baked fruit filled pastry and 2:12 regarding deep fried; See Admur 168:7 and Admur 678:11 for full details of baked jelly filled Sufganiyot

[2] Seder Birchas Hanehnin 2:10; See Admur 168:14; Michaber 168:8

Other opinions: Some Poskim rule that a blessing is never to be said over Sufganyiot upon eating it during a meal, whether in middle or end, even for pleasure purposes. [Or Letziyon 2:12 p. 101 being that some Poskim rule that fried is similar to baking, as brings Michaber in 168:13 and that jelly filled dough is Hamotzi, as brings Michaber in 168:7 and Admur 168:14; Halichos Shlomo Chanukah p. 319 and Madanei Shlomo p. 45 being that they also satiate and certainly one’s intent is also on this] Other Poskim rule that while a blessing is never to be recited while eating it in middle of a meal, nevertheless it is to be recited when eaten at the end of the meal as dessert. [Yabia Omer 8:26-4; Chazon Ovadia Chanukah 19]

[3] According to Admur in the Seder ibid, both deep fried dough or baked Jelly filled dough is Mezonos according to all opinions being eaten for pleasure purposes. However, according to Admur 168:14, baked dough is Hamotzi according to some opinions even if it is Jelly filled, and hence a blessing would never be said, as brought in the other opinions in the previous footnote.  

[4] Seder Birchas Hanehnin 2:12; Ketzos Hashulchan 48:9; P”M 318 M”Z 7