You can run both the mic and a pair of headphones.

On the left side there should be 1 or 2 XLR jacks, plug your mic into one of them.

Then on the right side, there should be a 3.5mm jack with a headphone symbol, plug your headphones into it.

I'm not quite sure how the 2i2 works but you should be able to toggle whether to monitor your voice through the interface.

Just connect it like any headphone with a 3.5mm connector.

From what I can see on Beyerdynamic's website, the T1 comes with a TRS 3.5mm cable with an adapter to 6.35mm. Your 2i2 should have a headphone out with a female 3.5mm. Therefore it should fit.