Preheat oven to 400°F. Slice the butter and add to a 9x13" pan. Then place into the oven until melted (about 2 minutes).
Whisk together the flour, sugar and salt in medium-sized bowl. Add milk and vanilla. Then beat in ONE egg at a time until smooth. For extra fluffy pancakes, beat 30 seconds per egg.
Pour mixture over melted butter and bake 18-20 mins., or until golden brown. Slice and serve warm with your favorite toppings.
Note: You can also make these in the blender to make it easier. Simply mix up the liquid and eggs first for about 30 seconds. Then add in the dry ingredients. They may not be quite as fluffy, but it works great for when you are in a hurry.