Jessica's Chicken Cobbler Casserole (Southern Living)

I have the best friends who share the best recipes. My sweet friend, Jessica, made this casserole for me when I returned home from the hospital. Oh my goodness, I fell in love. This is going to be the first meal I prepare in the Fall when it cools down enough to use the oven.

6 tablespoons melted butter, divided
4 cups cubed sourdough rolls
1/3 cup grated Parmesan cheese
2 tablespoons chopped fresh parsley
2 medium-size sweet onions, sliced
1 (8-ounce) package sliced fresh mushrooms
1 cup white wine
1 (10 3/4-ounce) can cream of mushroom soup
1/2 cup drained and chopped jarred roasted red bell peppers
2 1/2 cups shredded cooked chicken

Preparation
Toss 4 tablespoons melted butter with next 3 ingredients; set aside.
 Sauté onions in remaining 2 tablespoons butter in a large skillet over medium-high heat 15 minutes or until golden brown. Add mushrooms, and sauté 5 minutes.
 Stir in wine and next 3 ingredients; cook, stirring constantly, 5 minutes or until bubbly. Spoon mixture into a lightly greased 9-inch square baking dish; top evenly with bread mixture.
 Bake at 400° for 15 minutes or until golden brown.