Question

Hello Rabbi, as I understand it, in order to need to recite hamotzi there are two main criteria: 1) a certain number of grams, 2) establishing it as a meal. I don't know whether both are required or just one. Of course, all this is about something that is not actual bread, because for real bread you recite the blessing regardless. 
I'll give an example: a tortilla, or a mezonot roll. When I eat them, I treat them as a meal and establish a meal on them; on the other hand, I don't know whether I need to reach a certain quantity, and if not then recite mezonot. 
For now I recite hamotzi simply because that seems right to me.
I would be happy for the Rabbi's response and opinion.