Preheat the skillet: Start by preheating a nonstick skillet over medium heat. Once hot, melt 1 tablespoon of unsalted butter until it's bubbly and deliciously fragrant.

Whisk together the egg mixture: In a mixing bowl, combine the eggnog, eggs, ground cinnamon, freshly grated nutmeg, and vanilla extract. Whisk everything together until the mixture is smooth and well-combined.

Dip the bread: Take your thick slices of brioche or challah and dip each slice into the egg mixture. Allow them to soak for about 30 seconds on each side, ensuring they're well-coated and flavorful.

Cook the bread: Place the soaked slices in the preheated skillet and cook for approximately 3 minutes on each side. You'll want them to be golden brown and crispy—just the way French toast should be!

Repeat cooking: Once the first batch is done, set them aside on a warm plate. Repeat the dipping and cooking process for the remaining slices, adding more butter to the skillet as needed.

Serve your creation: Serve the Eggnog French Toast hot and fresh, dusted with powdered sugar or drizzled with warm maple syrup for that extra touch of indulgence.