Wipe the mushrooms with a clean, dry towel and cut off the stems. In a large bowl, mash the crabmeat with a fork. Add remaining ingredients and carefully mix with a spoon until combined.
Preheat oven to 350°F. Line a large baking sheet with foil. Spray foil with a non-stick vegetable oil spray. Using a teaspoon, fill each mushroom cap with the filling. Place each mushroom cap on the prepared baking sheet.
Bake stuffed mushrooms for 10 to 15 minutes or until the filling is nicely browned and heated through. Serve on a warm platter. Enjoy!