Step 1

Preheat oven to 375 degrees F. Coat a 9- x 13-inch baking dish with cooking spray.

Step 2

In a large pot, cook macaroni according to package directions; drain and set aside.

Step 3

In the same pot over medium heat, melt butter. Add flour, mustard, salt, and pepper; mix well. Gradually add milk and cook until thickened, stirring constantly. Add 2 cups cheese and continue stirring until melted. Remove from heat and stir in macaroni. Spoon mixture into baking dish.

Step 4

Pour chili evenly over macaroni and cheese, and top with remaining 1/2 cup cheese. Sprinkle French-fried onions over top.

Step 5

Bake 25 to 30 minutes, or until heated through and golden.