Cook macaroni noodles according to package directions and drain. Set aside.

Melt butter in a large saucepan over medium heat. Add flour, salt, and pepper. Whisk until well blended. Pour in the milk stirring constantly. Bring to a boil and boil for 2 minutes while stirring. Reduce heat and simmer for 10 minutes while stirring. Add cheddar, a little at a time and stir in until cheese melts. Remove from heat.

Add macaroni noodles to the saucepan and toss to coat with the cheese sauce.

Heat an outdoor grill to medium-high heat. Add the hot dog buns to the grill and cook until lightly toasted. Remove from the grill. Add the hot dogs and grilled until they are cooked to your liking. Serve on buns with mac and cheese and green onions.