2mediumor 1 large yellow onions, peeled and chopped
8ouncescriminibrown mushrooms, cleaned and sliced
3large garlic clovesminced
2tablespoonsfresh chopped oregano or 2 heaping teaspoons dried
1 1/2cupsdry red wine
4cupschopped Italian plum tomatoeswith their juices
3tablespoonstomato paste
1large bay leafor 2 small to medium
1/2teaspoonsalt
1/4teaspoonblack pepper
1/4teaspoonGround cayenne pepper or hot pepper flakes
3/4lbs.diced or shredded cooked chickenlight and dark meat
1lb.hotcooked spaghetti or thin spaghetti
1 to 1 1/2cuplower-sodium chicken broth
1/4lb.freshly grated Parmigiano-Reggiano
1/2lb.whole-milk mozzarellacoarsely grated
Instructions
Heat oil in a large, heavy-bottomed pot or Dutch oven over medium heat. Add onion and sauté until softened and translucent, about 5 minutes. Add mushrooms and sauté until they are opaque and firm, about 3 minutes. Add garlic and oregano and sauté until fragrant, about half a minute.
Add wine and bring to boil, stirring and scraping the bottom of the pot. Add tomatoes and tomato paste, stirring until smooth. Add bay leaf and season with salt, pepper and a pinch or so of cayenne pepper or pepper flakes. Bring to a simmer; reduce heat to medium-low. Simmer slowly until sauce is thick and flavors are well blended, 1 to 2 hours. Stir in cooked chicken, heat through, then turn off heat.
Preheat oven to 375F. Lightly grease a 9-by-13-inch casserole with olive oil.
Add cooked spaghetti to sauce, and toss until evenly coated and well mixed. Moisten with a cup or so of chicken broth as needed. Add half the Parmigiano and mozzarella and toss.
Pour into baking dish, smooth the top, and sprinkle evenly with remaining cheese. Bake until hot, bubbly and golden on top, about 30 minutes.