In a bowl toss mushrooms, Worcestershire sauce, chives and olive oil. Season with salt and pepper. In a preheated 400°F oven, place mushrooms on a sheet pan and roast for about 15 minutes. Make sure to stir every couple of minutes to thoroughly roast. Remove and place in a bowl. Add sour cream. Spoon mixture over toasted baguette, garnish with crumbled blue cheese.