Step 1

Cook asparagus in a saucepan of boiling water until bright green but still crisp, about 2 minutes. Transfer asparagus to ice water to stop the cooking process. Drain and set aside.

Step 2

Melt butter in a saucepan over medium-low heat. Whisk in flour and stir until mixture becomes paste-like and light golden brown, about 2 minutes.

Step 3

Whisk milk into butter-flour mixture; bring to a simmer and cook until thick, 2 to 3 minutes. Season with salt and cayenne pepper.

Step 4

Place milk mixture, garlic, and asparagus in a blender and puree until smooth.

Step 5

Pour asparagus mixture into a large bowl; stir in egg yolks and Cheddar cheese.

Step 6

Preheat oven to 375 degrees F (190 degrees C)

Step 7

Generously butter 4 (6-ounce) ramekins

Step 8

Beat egg whites in a large glass or metal mixing bowl until soft peaks form. Lift your beater or whisk straight up: the egg whites will form soft mounds rather than a sharp peak

Step 9

Stir half of egg whites into asparagus cheese mixture until just combined. Gently fold remaining egg whites into mixture.

Step 10

Fill prepared ramekins about 3/4 full and place on a baking sheet; bake in the preheated oven until edges are golden brown, about 20 to 25 minutes