Smoked Crab Stuffed Mushrooms

This is a great recipe. Forget where I got it, but oh so good.

Ingredients:
35 fresh mushrooms
1/4 cup celery, finely chopped
2 tablespoons onion, finely chopped
2 tablespoons red bell pepper, finely chopped
1/2 pound crab claw meat
2 cups oyster crackers crushed
1/2 cup cheddar cheese, shredded
1/4 teaspoon garlic powder
1/2 teaspoon Old Bay Seasoning
1/4 teaspoon black pepper, ground
1/4 teaspoon salt
1 egg
1/2 cup water
6 white cheddar cheese, slices
Directions:Preheat oven to 400degrees F. Saute celery, onion, and pepper in butter for 2 minutes, transfer to a plate and cool in the refrigerator. While vegetables cool, wash mushrooms and remove stems. Set caps to the side and finely chop half of the stems. Discard the other half of the stems or use elsewhere. Combine the sauteed vegetables, chopped mushroom stems, and all other ingredients (except cheese slices) and mix well. Place mushroom caps in individual buttered casseroles or baking dishes. Spoon 1 teaspoon of stuffing into each mushroom. Cover with sliced cheese.