In a medium bowl, whisk together the eggs, milk, vanilla, butter, and sweet potatoes until well blended.
Stir wet ingredients into dry ingredients, just until combined. Batter will be slightly lumpy.
Pour batter about 1/4 to 1/3 cup at a time onto a greased hot griddle or skillet. Turn when bubbles form on the top of pancakes. Flip, and cook until second side is golden brown.
Keep warm in a 250 degree F oven until ready to serve.