For the pasta and chicken
01 -
12 oz (340 g) spaghetti
02 -
3 cups (420 g) cooked shredded chicken
03 -
1 cup (120 g) frozen peas, optional
04 -
1 tablespoon butter, for the baking dish
For the Parmesan sauce
05 -
4 tablespoons (56 g) unsalted butter
06 -
8 oz (225 g) cremini or button mushrooms, sliced
07 -
1 small yellow onion, finely diced
08 -
3 cloves garlic, minced
09 -
1/4 cup (32 g) all-purpose flour
10 -
2 cups (480 ml) low-sodium chicken broth
11 -
1 cup (240 ml) whole milk
12 -
1 cup (240 ml) heavy cream
13 -
1 teaspoon kosher salt, plus more for pasta water
14 -
1/2 teaspoon black pepper
15 -
1/4 teaspoon dried thyme
16 -
1 cup (90 g) freshly grated Parmesan cheese
For the topping
17 -
3/4 cup (45 g) panko breadcrumbs
18 -
2 tablespoons (28 g) unsalted butter, melted
19 -
1/3 cup (30 g) freshly grated Parmesan cheese
20 -
2 tablespoons chopped fresh parsley