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I would cook the spinach first and drain it well.
Then add it to the completed mac and cheese.
You certainly could put it all in the oven with breadcrumbs too but you don't need to.
If you do, I would recommend adding a little more milk and butter/margarine to account for evaporation and the macaroni absorbing it while it bakes.
Enjoy!

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I don't see why not.
That sounds like a great recipe!
Well I guess it all depends on how you like your spinach.
With the frozen spinach, once defrosted, I actually just mix it in to dish, since it has already been precooked - now it just needs to be heated.
Cheesy Spinach Casserole
2 (7.25 oz) macaroni and cheese boxed dinners
1 3/4 c. milk
1/4 c. butter
1 small onion, chopped
1/4 t. salt
1/8 t. pepper
1 package (10 oz.) frozen chopped spinach (thawed, dried)
1 c. shredded American or Cheddar cheese.

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Step 1
Preheat oven to 400 degrees.
Spray a 2 quart casserole dish with cooking spray.
Cook the macaroni according to package directions, then drain.
Step 2
In a pot, melt the butter and cook the chopped onion until tender.
Stir in milk and 2 powdered cheese pouches from the macaroni and cheese dinner boxes, along with the salt and pepper.
Bring to a boil.
Stir for 1 minute.

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Mix in reserved macaroni, spinach, and 3/4 c. cheese.
Step 3
Pour into the casserole dish and sprinkle on 1/4 c. cheese.
Bake for 15-18 minutes or until lightly browned.
Serve!