Hot Cocoa Mix

I'm never bothering to buy hot cocoa mix again.  I make this exactly as Alton Brown's recipe dictates.  I went through the first batch inside a week, so I doubled the recipe and made it again tonight.

Ingredients

• 2 cups powdered sugar
• 1 cup cocoa (Dutch-process preferred)
• 2 1/2 cups powdered milk
• 1 teaspoon salt
• 2 teaspoons cornstarch
• 1 pinch cayenne pepper, or more to taste
• Hot water

Directions

1. Combine all ingredients (except water) in a container, cover, and shake to incorporate thoroughly.

2. Fill mug half full with hot cocoa mix, add hot water, and stir.  Serve hot.