According to this (which includes footnotes to the original sources) the bracha is Mezonot.
There are two main instances where the bracha on bread is Mezonot:
• when small pieces of bread are mixed with other ingredients, to the pint that they are no longer recognizable as bread • when small pieces of bread are cooked
When bread is 1) broken into pieces smaller than a kezayit, and 2) mixed with other ingredients,3 if the pieces are no longer recognizable as bread. Generally, the bread loses its taste from being immersed in the other ingredients, and the bracha becomes Mezonot.4 This is true even if the small pieces of "bread" are subsequently joined together and made into one food that is larger than a kezayit.5