Heat oven to 400 degrees F. Coat 12 cups of a standard size muffin pan with cooking spray.
Cook macaroni in large saucepan, as directed on package. During the last minute of cooking, add spinach. Drain well in a colander; set aside.
In the same saucepan set to medium heat, melt butter. Whisk in flour; cook and stir 1 minute. Gradually stir in milk and cook 2 minutes, or until thickened, stirring frequently. Add Cheese Sauce. Reduce heat to low and cook, stirring for 1-2 minutes, until blended. Remove from heat.
Add macaroni, egg, artichoke hearts, and shredded cheese. Spoon into prepared muffin cups.
Bake 13 to 15 minutes, or until golden brown. Cool 5 minutes before removing from muffin cups to serve.