In a large saucepan, stir together the blueberries, olive oil, red wine vinegar, and red onion. Place the pan over medium heat and bring to a simmer. Stir in the mushrooms and heat for 1 to 2 minutes, until mushrooms are heated through. Turn off the heat. Cover to keep warm.
In a large bowl, toss the frisee and baby spinach together with the warm dressing. Divide the salad among salad plates and top each salad with a sprinkle of almonds, a few crumbles of cheese, and some blueberries. Serve immediately.
This recipe was created by a contestant during a cooking competition. It has not been tested for home use.