Tip: click step to get into cook mode
Preheat oven to 425 degrees F.
As oven preheats, put the butter in an un-greased 9x13-in. metal baking dish and place in oven, just until melted.
Place the eggs, milk, flour, salt and vanilla in a blender; cover and process until smooth.
Pour batter into baking dish, over melted butter.
Bake for 22-27 minutes or until edges are golden brown and puffy.
To serve, sprinkle generously with powdered sugar and syrup.