In a large bowl, whisk together the flour, sugar, baking powder, salt, nutmeg, and cinnamon until well combined.
In another bowl, mix the eggnog, melted butter, eggs, and vanilla extract until smooth.
Gently fold the wet ingredients into the dry ingredients. Stir until just combined. The batter might be slightly lumpy, but avoid overmixing to keep the pancakes fluffy.
Warm a non-stick skillet or griddle over medium-high heat and lightly coat it with cooking spray or a small amount of melted butter.
Using a ¼ cup measure, pour the pancake batter onto the skillet. Allow sufficient space between each pancake to avoid merging during cooking.
Allow to cook until bubbles form on the surface of the pancakes (usually 2-3 minutes). Then flip them using a spatula and cook for an additional 1-2 minutes, or until golden brown and cooked through. Repeat with remaining batter.
Plate the pancakes and serve warm with your chosen toppings such as whipped cream, maple syrup, fresh fruit, or a light dusting of powdered sugar.