Wild Mushroom and Spinach Stuffing

(recipe from Bon Appetit magazine)

3/4 cup (1 1/2 sticks) unsalted butter, divided
1 Tbsp. olive oil
1 lb. assorted fresh wild mushrooms (such as chanterelle, stemmed shiitake, and crimini), cut into 1/2-inch dice (about 9 cups)
3 cups chopped onions (about 1 lb.)
2 cups chopped celery (4 to 5 stalks)
1/4 cup chopped fresh parsley
2 Tbsp. chopped fresh sage
2 Tbsp. chopped fresh thyme
5 ounces baby spinach leaves
12 cups (generous) 1-inch cubes day-old pain rustique or ciabatta bread with crust (about 1 1/4 lbs.)
2 large eggs
1 1/2 tsp. fine sea salt
1 tsp. ground black pepper
1 cup (or more) broth

Melt 1/4 cup butter with olive oil in heavy large skillet over medium-high heat.  Add diced wild mushrooms and sprinkle lightly with salt and pepper.  Saute until mushrooms are tender and beginning to brown, about 8 minutes.  Transfer mushrooms to large bowl.

Melt remaining 1/2 cup butter in same skillet over medium heat.  Add onions and celery.  Saute until vegetables are tender, about 12 minutes.  Add all herbs; sauté 1 minute longer.  Add spinach and toss until just wilted, about 1 minute.  Add vegetable mixture to bowl with mushrooms.  DO AHEAD: Can be made 1 day ahead.  Cool, cover, and chill.

Preheat oven to 350F.  Divide bread between 2 rimmed baking sheets.  Bake until bread is crusty but not hard, reversing sheets after 5 minutes, 10 to 12 minutes total.  Transfer to very large bowl and cool.

Butter 13x9x2-inch baking dish.  Stir vegetable mixture into bread.  Whisk eggs, salt, and pepper in small bowl to blend well; whisk in 1 cup broth.  Add egg mixture to stuffing, tossing to combine evenly and adding more broth by 1/4 cupfuls if dry.  Transfer stuffing to prepared dish.

Bake stuffing uncovered until cooked through and brown and crusty on top, 50 to 60 minutes.  Let stand 10 minutes.

(Stuffing is always tasty, this one particularly with the mushrooms throughout.  I skipped the bread cube baking step, as I had cut my bread the day before and left it out overnight on the counter to dry out.  Thanksgiving 2015 - me alone and a whole bunch of stuffing!  Yum.)