Heat a griddle to 350°F to 375°F, spraying it with nonstick cooking spray if necessary. (You could also use a skillet.)
In a large bowl, whisk eggs, eggnog, vanilla, cinnamon, nutmeg, and salt until smooth.
Dip each slice of bread into the eggnog mixture, making sure to coat each side of the bread (but do not soak it). After coating, hold the slice above the bowl for a few seconds to allow the excess egg mixture to drain.
Place on the preheated griddle and cook for 2-3 minutes on each side, or until golden brown. Spray more cooking spray onto the griddle between batches, or as needed.
Serve immediately topped with maple syrup and eggnog whipped cream.