Start by preheating oven to 425F.
While the oven preheats, add butter to 9x13 baking dish and place in oven just until the butter melts.
In a blender, add eggs, milk, flour, salt, vanilla extract, and sugar. Cover and blend on medium until smooth.
Pour German pancake batter from blender directly in to baking dish over the melted butter.
Bake at 425F for about 25 minutes or until edges become puffy and golden brown.
Serve immediately with your favorite pancake toppings. Maple syrup, powdered sugar, butter, whipped cream, and/or fresh berries are all great options!