
Heat the oven to 375°F. Break the spaghetti in half and cook 2 minutes less than the package time; drain.
Melt the butter in a large pot over medium heat and cook the mushrooms 5 minutes. Stir in the flour for 1 minute.
Slowly whisk in the broth and milk and simmer 4 minutes until thickened; stir in half the parmesan and season with salt and pepper.
Fold in the spaghetti, shredded chicken, and peas, then spread in a greased 9x13 dish.
Top with panko and the remaining parmesan and bake 20 minutes until golden, bubbly, and heated through to 165°F.
Photo: DinnerDrop