Add the crushed crackers to a small mixing bowl and pour the stick of melted butter over top. Stir to combine, then set aside.
1 3/4 - 2 cups crushed ritz crackers, 1 stick butter
Add the remaining butter to a large skillet set over medium heat. Once melted add the flour and whisk into the butter to form a paste. Cook for 60 seconds to remove the flour taste.
4 tbsp butter, 3 tbsp flour
Pour in half a cup of milk, whisking constantly until thickened. Whisk in the rest of the milk and simmer just until thickened.
1 1/2 - 2 cups milk
Remove the skillet from heat, add the cheese, and stir until the cheese has completely melted and the sauce is smooth.
2 cups shredded cheddar cheese
Spray a 9x13" baking dish with nonstick cooking spray, then spread half the crushed crackers evenly out over the bottom.
Arrange the asparagus over the cracker crumbs in an even layer. Pour the cheese sauce over the asparagus and spread evenly out overtop using a spatula. Top with the remaining crushed crackers.
3 15 oz cans extra long asparagus
Bake uncovered at 350° for 25-30 minutes, just until the casserole's hot & bubbly and the cracker topping's golden brown & crispy.
Carefully remove the hot dish from the oven and let it rest for 5 minutes.
Serve warm and enjoy!