Q. How does one reach meah brachos (hundred blessings one should recite every day) on Yom Tov. Some of the birkas hashachar are lost due to not sleeping, plus we eat only two seudas, and it may be hard to eat so many snacks during the course of the day? What should one do?
A. On the onset one should try to add as many brochos as he can from different foods and smells, always being careful not to recite unnecessary brochos. (As Poskim disagree if it is permitted to bless unnecessary brochos for the purpose of completing the hundred brochos on Shabbos and Yom Tov; see Magen Avrohom 215: 6, quoting the Shaloh).
Shulchan Aruch (O.H. 284: 3) rules that one should have intention to listen to the brochos of the people being called for an aliya to the Torah and for the Haftarah and answer amen after them, which will count to complete the hundred brochos during Shabbos.
Kol Bo (36) and Rokeach (319) maintain that the recitation of Ein K’Elokenu at the end of davening that includes twenty mentions of the name of Hashem, counts as adding twenty brochos. (See also Sefer Meah Brochos for other considerations).
Rabbi A. Bartfeld as advised by Horav Shlomo Miller Shlit’a