Preheat over 30 degrees Fahrenheit.
Wash mushrooms and remove the stem from the caps. Set caps aside and chop the stems. Set aside.
In a medium sized pot or wok, saute the onions in medium heat until translucent.
Add the red pepper and celery. Mix until cooked.
Add bread and mix.
Add oregano, garlic powder, onion powder. Mix.
Add the unsweetened almond milk and mix.
Salt and pepper to taste.
Grease a baking sheet with oil spray. Place mushroom caps on the baking sheet to be filled. Stuff the mushrooms with the bread stuffing. Bake for 15-20 minutes until mushrooms are cooked and the stuffing looks crunchy.