A – Good morning.
He should make Bracha if he drinks it seperatly.the concept of bitul is only if you have no reason to drink it at all and the only reason your drinking it is to be able to tolerate the cookie
Q – Separately without the cookie at all? Because if it wasn’t for the cookies I would not have made tea…but at the time I enjoy the tea as well.
A – Two brachot, one for the tea