Preheat oven to 400 degrees F.
Pour melted butter in a 13 by 9-inch baking dish then tilt back and forth to coat evenly while coming about 1-inch up the sides of the pan as well.
To a blender add eggs, milk, salt, vanilla, sugar and flour then cover and blend just until combined, about 5 to 10 seconds (scrape down sides of blender and mix as needed).
Pour batter into prepared baking dish (while scraping any excess batter from blender into dish).
Bake in preheated oven until cooked through, about 15 - 18 minutes (you can also broil during approx. the last 1 minute if it's not very golden on top).
Cut into slices and serve immediately with syrup of choice.
*Note that I've made this 2 more times with these ratios since taking these photos and it's come up more billowy in the center, just so you know what to expect :). Same texture, same flavor it just fluffs up where it wants.
Recipe source: Cooking Classy