Proper cook times for mushrooms, onions, and peppers One of my favorite meals is poached chicken cut into strips and stir fried with mushrooms, onions, and peppers and a bit of oil-based salad dressing for flavor.

However, most of the time I get the timing wrong and end up with over or undercooked veggies by the time the chicken is done cooking.

How long should I cook the mushrooms, onions, and peppers for? It seems to work best to add the onions first so that they cook down a little bit but I'm always guessing when to add the peppers and mushrooms to the skillet.
I am going to make the assumption that you're stir-frying in a really hot pan. The onions and peppers are going to take around 5-8 minutes to get good color but retain their snap.

I would cook the mushrooms separately - they're going to take a little longer 8-10 minutes, because they give off a bit of moisture.

So as you're poaching the chicken I would 


Fry the onions/peppers - remove and keep warm
Fry Mushrooms
When the mushrooms are done, add everything else to pan to meld flavors.