Cheesy Stuffed Mushrooms - cooking recipe

Ingredients

3 slices sandwich bread (crusts removed)
2 tablespoons olive oil
salt and pepper
20 large white button mushrooms (about 2-1/2 inches in diameter)
3 tablespoons butter (no substitutes)
1 medium onion, very finely chopped
1 stalk celery, very finely chopped
1 tablespoon fresh minced garlic
3/4 teaspoon dried oregano
1/4 cup grated parmesan cheese
1/4 cup asiago cheese
1/4 cup chopped fresh parsley
1 cup mozzarella cheese, shredded (or to taste)

Preparation

Pulse the fresh bread in a food processor, then transfer to a bowl and toss with 2 tablespoons olive or vegetable oil, salt and pepper (I use about 3/4 teaspoon seasoning salt or white salt).
Spread the mixture onto a baking sheet and bake until golden (about 6-8 minutes) transfer to a bowl.
Carefully remove the stems from the mushroom caps and finely chop.
Lay the mushroom caps stemmed side down on a lightly greased baking sheet (set oven rack to second-lowest position or middle rack for this) bake for about 12 minutes at 375 degrees.
White the caps are baking, melt about 3 tablespoon butter in a heavy skillet over medium-high heat.
Saute the chopped stems, stirring until golden (about 5-6 minutes).
Add in onion, celery, garlic, oregano, salt and black pepper; saute stirring occasionally until the onion is golden (about 5 minutes) cool veggies slightly, then add in the bread crumb mixture with Parmesan, asiago and chopped parsley; toss well to combine.
Remove the caps from the oven, turn over, then spoon the filling into the caps pressing gently (there might be some filling left over).
Bake second-lowest rack or middle oven at 375 degrees or until tender and the stuffing is golden brown (about 20-22 minutes).
Remove from oven and sprinkle the caps with grated mozzeralla cheese, return to oven (or broil) for about 5 minutes or until the cheese has melted.
Delicious!