A blessing for manna – Ask the Rabbi
Q. Which b’rachah did the Israelites say over the manna in the desert?
A. According to the Talmud (B’rachot 48b), Moses instituted the saying of ha-zan (the first blessing of the grace after meals) at the time when the manna descended from heaven. Thus they had to bensch after eating manna.
They also had to say motzi, since it is called bread in Exodus 16:4 and elsewhere.