Mushrooms stuffed with Apples and Herbs

Description
This is a nice canadian appetizer which can be used as a good started or as a sidedish. With basic cooking skills needed this makes a fast & delicious way to surprise your guests !

Ingredients

 * 20 large button mushrooms
 * 1 tablespoon light soy sauce
 * 2 teaspoons extra-virgin olive oil, divided
 * 3 teaspoons balsamic vinegar, divided
 * non-stick cooking spray
 * 1 small leek, white part only, chopped
 * 1 stalk celery, minced
 * 1 red apple, peeled, cored and diced
 * 2 tablespoons minced parsley
 * ¼ teaspoon oregano
 * ¼ teaspoon basil
 * salt and freshly ground black pepper, to taste
 * 2 teaspoons butter
 * ½ cup whole-wheat bread crumbs
 * 2 tablespoons grated Parmesan cheese
 * 2 teaspoons vegetable stock

Directions

 * 1) Preheat oven to 450 °F.
 * 2) Remove stems from mushrooms. Chop stems and set aside.
 * 3) In large bowl, mix soy sauce, 1 teaspoon olive oil and 1 teaspoon balsamic vinegar.
 * 4) Add mushroom caps.
 * 5) Using hands or large spoon, coat each mushroom with mixture and place on a lightly sprayed baking sheet. Set aside.
 * 6) In skillet over medium heat, add remaining oil and sauté mushroom stems, leek, celery, apple, parsley, oregano, basil and salt and pepper, to taste, for 7 minutes.
 * 7) Add butter and bread crumbs.
 * 8) Stir to combine and melt butter.
 * 9) Transfer to bowl.
 * 10) Add Parmesan and vegetable stock.
 * 11) Stuff each mushroom with a slightly rounded tablespoon of filling.
 * 12) Brush remaining balsamic vinegar over top of each mushroom.
 * 13) Bake uncovered for 25 minutes.