Like Dent said, try an EZ Out first. But having to remove a ton of broken screws in my line of work I find they usually work 50% of the time. Most of the time I just go straight to drilling it out and re tapping. That usually works 90% of the time. The key is using the correct size bit for the tap size. They are usually metric sized bits so don’t use a standard bit from your drill set.

No, the drill bit to drill out the standard screw is metric so it’s slightly smaller than the standard tap size. If you use a standard size bit you have to go a step smaller than the screw thread size which makes it more difficult to tap since you have to cut thru much more material. That being said if you use a bit the same size of the existing screw than you have to up the tap size as all the material will be gone to re tap the original size threads. Hope that makes sense

We don’t know what you have available wherever your at so a trip to the store might be your only choice no matter what direction you go, but like others have said, you can just pry it out with a small flat head screwdriver from the tooth side of the t-nut or simply punch it out from the top side and be done with it. Install new t-nut