Mac & Cheese Dog Casserole

I know this sounds weird or disgusting.....it's not.  This comes courteous of Rachel Ray and is very tasty and kid friendly.  I made this for dinner last night and we reheated it for lunch today....reheats great!

1 lb. elbow macaroni

salt

2 tbsp. olive oil, divided

1 pkt. hot dogs, chopped into 1" pieces (we use all beef)

1 tbsp. butter

1 medium onion, finely chopped

2 tbsp. flour

1/2 c. chicken broth

2 c. milk

pepper

1 tbsp. spicy mustard

2 tbsp. ketchup

2-3 c. cheddar, shredded & divided

Boil a large pot of water for macaroni.  Salt water and under cook macaroni, about 7 minutes until just under al dente in doneness.  Preheat broiler and set rack 12 inches from heat.  While pasta is cooking, heat a large deep nonstick skillet over medium-high heat.  Add 1 tablespoon olive oil, then add hot dogs and brown on both sides, 4 minutes total.  Remove the dogs with a slotted spoon to a paper towel lined plate.  Add another tablespoon olive oil and butter.  When butter melts, cook onions, 4-5 minutes, then add flour and cook another minute.  Add chicken broth and cook off immediately, 1 minute.  Whisk in milk and bring to a bubble, then season the sauce with salt and pepper and stir in the mustard and ketchup.  Lower heat and add 2 cups of the cheese.  Stir to melt, 1 minutes.  Adjust mustard, ketchup, salt and pepper to your taste.  Drain pasta well.  Combine pasta and hot dogs with sauce and coat evenly then pour into casserole dish and top with remaining cheese.  Melt and brown cheese under broiler, 2 minutes.