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Also question is, why do my brownies fall apart?
When you beat the eggs and butter you incorporate airinto them, and the flour stabilizes the air bubbles. But if toomuch air is in the mixture for the amount of flour, thebrownies "over-expand" as they bake, but collapse, or cavein, as they cool and the unstable air bubbles deflate.
Similarly, you may ask, how long should brownies cool before cutting?
Let the brownies cool completely, about 30minutes, in the pan before slicing into them.
Brownies should be removed from the oven beforethe centre is fully cooked, as the brownies will continue toset as they cool and this gives the brownie its softtexture. You do not want the brownies to be raw in thecentre when you remove them from the oven, but they should beslightly undercooked.