Preheat oven to 400oF.
In a large pot over medium-low heat, melt butter. Whisk in flour and cook 2 minutes, stirring constantly. Stir in the salt, pepper and warm milk. Cook and whisk until sauce has thickened and is smooth. Turn heat to lowest setting; stir in cheeses. Turn off heat; continue stirring until sauce is smooth. Gently blend in the pasta, crabmeat and asparagus. Turn mixture into a spray coated 9x13-inch pan or 8 (1-1/2 cup) baking dishes.
Blend together breadcrumbs, smoked paprika and thyme; sprinkle evenly over pasta. Bake 20 minutes or until sauce is bubbly and topping is browned.
Where to buy king crab legs
While people living near crabbing communities can get live crab, that's still limited to the short crabbing season. Who wants to wait until just a few months a year to enjoy crab? Certainly not us! That's why Global Seafoods is here to let you buy crab meat, no matter the time of year or where you live. Alaskan king crab price per pound can fluctuate throughout the year, but we promise we always have the highest quality crab for the best price, and it's delivered right to your door.