Heat olive oil in a skillet on medium heat.
Add mushrooms and sauté for 1 minute.
Add red wine, salt, pepper and thyme.
Sauté, stirring often, until liquid has been absorbed by mushrooms (about 10 minutes). Remove from heat.
In a large salad bowl, add arugula and tomatoes.
Cover arugula with warm mushrooms.
Toss salad with red onion, blue cheese, croutons and balsamic vinegar.
Serve immediately.
