Creamy Squash Mac 'n' Cheese

Preheat oven to 350°F. Coat a 13x9-inch baking dish with cooking spray.

Cook pasta in a large pot according to package directions. Drain, and return to the pot.

While the pasta cooks, melt 4 Tbs. butter in a large saucepan over medium heat. Whisk in the flour until smooth, about 30 seconds. Whisk in the milk. Bring to a boil over medium heat, whisking frequently, about 8 minutes. Remove from heat. Stir in mustard, salt, pepper, and nutmeg. Slowly add cheese, stirring until melted. Stir in squash. Add cheese sauce to cooked pasta; stir gently to coat.

Transfer mixture to the prepared dish, and sprinkle with panko. Bake for 30 minutes or until bubbly