Why is the bracha on oatmeal mezonot and on granola bars adama?
ב"ה Shalom When one of the five grains is cooked the Bracha is "mezonot". Shulchan Aruch (Orach Chaim 208:2).However, if the grains are toasted and are whole, the Shulchan Aruch (Orach Chaim 208:4) says to say " Hadama" because they remain in the status of a vegetable and not a cooked food. Since, in granola bars, the grains seem to be whole, it warrants "Hadama". However, the Mishna Berura (Orach Chaim 208:3,15) says that if grains are no longer whole and broken down by the cooking process, even if they were once whole, one should say Mezonot. Therefore, according to the Mishna Berura, there are those who are of the opinion to say mezonot are granola bars since it is most likely that in the preparation process the grain no longer remained whole. All the best