2 pounds thin asparagus
3 cups water
salt and pepper
2 tablespoons unsalted butter
2 tablespoons flour (I used whole wheat)
¾ cup Parmesan cheese, grated and divided
½ cup Monterey Jack cheese, shredded

Adjust oven rack to upper-middle position and heat broiler. Line broiler safe baking dish with paper towels or a lint free kitchen cloth. Snap the woody ends off the asparagus and set both stalks and ends aside. Bring water to a boil in a large skillet over medium-high heat. Add asparagus ends and ¼ teaspoon salt and cook covered, for 5 minutes. Using slotted spoon, remove asparagus ends and discard. Add asparagus stalks to skillet, cover and cook, stirring occasionally, until nearly tender,2-4 minutes. Transfer asparagus to paper/cloth-lined baking dish. Pour asparagus water into liquid measuring cup. If liquid does not read 1-cup mark, add water until it does. Melt butter in now empty skillet over medium heat. Add flour and cook, stirring constantly until golden, about 1 minute. Whisk in reserved asparagus water and bring to boil. Reduce heat to medium-low and simmer until thickened, 3-5 minutes. Off heat, whisk in ½ cup Parmesan and Monterey jack until smooth. Season with salt and pepper. Cover and let stand for 5 minutes. Remove paper towels from baking dish. Drizzle sauce over center of asparagus and top with remaining Parmesan. Broil until cheese is golden and asparagus is tender, 4-8 minutes. Serve.