|Onion||1 Small, chopped|
|Frozen chopped spinach||1|
|Egg||1 , beaten|
|Seasoned bread crumbs||1⁄2 Cup (8 tbs)|
Remove stems from mushrooms; chop finely.
Saute with onion in melted butter.
Cook spinach according to package di rections; drain well.
Add sauted mushroom stems, onion, and egg; stir.
Season with salt and pepper.
Stuff mushroom caps.
Place into casserole; sprinkle crumbs on top.
Place into toaster oven; top brown until bubbly.