what is bracha of nature valley rolled oats bars?
Depends how it is made. On raw oats the brocho is borei pri hoadomo, if they are ground and baked it is hamotzei. If they are cooked it is mezonos. If fried in shallow oil is doubtful if considered as cooking. Perhaps hoadomo would be the best thing to do.
O:CH 168:10 Mishnah Berurah 56, O:CH 208:2 & 4 Mishnah Berurah 4,6 & 15