Hearty Ham and Broccoli Macaroni and Cheese

I really liked this.  If you don't have ham substitute with bacon.  This is from the 2014 Milk Calendar

1 tbsp butter
1 small onion, minced
1/4 cup chopped celery
2 tbsp all purpose flour
1 1/3 cups milk
1 can 2% evaporated milk
1 cup shredded Canadian old Cheddar cheese
1/3 cup shredded Canadian Parmesan cheese
1/2 tsp each salt and pepper
2 cups macaroni
3 cups small broccoli florets
1 cup diced black forest ham or cooked crumbled bacon (optional)

Topping
2 tbsp butter, melted
1 1/2 cups fresh bread crumbs (or Panko)
1 tbsp dried Italian seasoning

• Preheat oven to 375F.  Butter an 8 cup casserole dish.
• In a large saucepan, melt butter over medium heat; saute onion and celery for about 3 min or until lightly golden.  Sprinkle with flour; cook, stirring for 1 min.  Whisk in milk and evaporated milk; cook, stirring for about 5 min or until thickened.  Remove from heat; stir in Cheddar and Parmesan cheese, salt and pepper.  
• Meanwhile, in a large pot of boiling water, cook macaroni for 5 min or until almost tender.  Add broccoli; cook for 1 min.  Drain and add to sauce along with ham; stir to coat.  Spread into prepared casserole dish.
• For Topping; in small bowl, combine butter, bread crumbs and Italian seasoning.  Sprinkle over macaroni.  Bake in preheated oven for about 20 min or until bubbly and golden.