I love a good stuffed mushroom, either as finger food, an appetizer, or even a main course. They are incredibly versatile and the stuffing can be as varied as your imagination allows. I'm going to give you a very basic recipe and then suggestions for how you can customize these, but don't be limited by my suggestions.
16 ounces of good whole mushrooms. I like Baby Bellas (small portobello mushrooms) because they've got a hearty taste. But if you like something mellower, feel free to use white button mushrooms. The important thing is that they have a nice hollow interior to stuff .
1 small onion, diced
3-4 large garlic cloves, minced
Extra virgin olive oil
Salt and pepper to taste
Bread crumbs (any kind will do)
Take your mushrooms and if there's any dirt on them, wipe it off with a damp paper towel. DO NOT rinse your mushrooms with water because they will absorb too much and it will ruin the texture of your finished product.
Remove all the stems from your mushrooms and mince them up.
Saute the onion and garlic in olive oil with a pinch of salt and some pepper until translucent and then add the minced mushroom stems and continue to saute for another 4-5 minutes.
When the mushroom, onion and garlic mixture is cooked, add in enough bread crumbs to make it all come together. Roughly 2/3 of a cup. You can use plain or seasoned, fine or panko. They're all good. Toss with enough additional olive oil to bring it all together, and taste your mixture for salt and pepper. Adjust to your taste.
You can now spoon this mixture into your mushrooms. Really pack it in there and leave a nice mound on the top. Put them in a baking dish and roast them in a 450 degree oven for about 15-20 minutes. They're done when the top is golden brown.
Now for the customization -- you can take the basic mixture and add pretty much anything you want.
To keep things vegetarian, add some chopped spinach, shredded carrots and/or zucchini, etc. Or you could caramelize a few more onions and add them and some thyme to the mixture.
It's always great to add some cheese -- I like parmigiano reggiano or crumbled feta, but again, whatever is your favorite is great! A good smoked cheese would be delicious too.
Crabmeat or crumbled sausage is also a popular add-in and turns this into a much heartier dish that could serve as a main course. Indeed, if you've ever been to a real NYC diner, crabmeat stuffed mushrooms are a very popular entree.
These are just a few suggestions -- the sky is the limit and whatever flavor combos you like can work in this recipe.