In a 10-inch skillet over medium heat, sweat the onions in the butter. Add the garlic and mushrooms and saute for 2 minutes. Add the flour and cook for 2 to 5 minutes. Slowly whisk in the milk and season with the cayenne, salt, and pepper, to taste. Fold in the bacon bits.
Preheat the grill to high heat.
Blanch the green beans in salted boiling water for 3 to 5 minutes. Remove to an ice bath for 2 to 3 minutes. Remove from the ice bath, drain, and pat dry with a paper towel when cool. Toss the green beans in the extra-virgin olive oil and a little salt and pepper. Grill for 3 minutes.
Place the green beans on a plate and top with the mushroom sauce and fried onions.
This recipe was created by a contestant during a cooking competition. It has not been tested for home use.