Preheat the oven to 400. Place the butter in a 9x13 and put into the oven to melt and become slightly bubbly.

In a bowl, whisk together the 4 eggs until combined.

Add the flour, milk, salt, and sugar. Blend together until batter is thin.

Pull the pan out of the oven with the melted butter that is slightly bubbly.

Gently and slowly, pour the batter on top of the melted butter.

Bake at 400 degrees for 25-30 minutes. It's done when it's golden brown around the edges and bubbled up over the sides.