Can you make a delicious dish if the only ingredients you have are tofu, mushroom, zucchini and broccoli?

not my thing but go for it. experiment and see how it works out. Who knows you might like it

yes try a stir fry . vegan stir fry or skewer it then fry .

I could, not sure if it is in your wheelhouse since you feel the need to ask instead of searching for recipes.

Short of having spices to flavor it? No. 

This sounds like a tasty stir fry - of course you also need peanut oil and I'd be wanting some peppers, onion and garlic.

Keeo the tofu.  Yes, I can.

Yes, you can have a tasty stir fry.

Depends on your idea of delicious, doesn't it? I'd want to add a little seasoning.

If you have no salt, no oil, and no seasonings of any kind, probably not. You could make something, but it would be very bland. If you have "pantry ingredients" like a little oil, salt & seasonings, then yes. 

If I can add herbs and spices, yes. 

If not, then maybe. I can probably ground up the mushroom and stuff it into the tofu. Mushroom has umami which is one of the new six taste buds. Maybe grill the zucchini and broccoli.