Preheat the oven to 425 degrees F, and mist mini muffin pans with non-stick spray.
Place the baking mix, eggnog, melted butter, and eggs in a large bowl and stir together until combined. Fill the wells of the mini muffin pans 3/4 full with the batter, and bake for 5 minutes. Turn the oven temperature down to 350 degrees F, and continue to bake for another 6 to 10 minutes, or until a skewer inserted in the thickest part of the muffin comes out clean or with a few moist crumbs.
Cool completely, then coat with eggnog glaze.
To make the eggnog glaze:
Stir the powdered sugar, eggnog, and nutmeg together in a medium bowl until smooth.