Preheat Oven: Set your oven to 425°F (220°C). Place the butter in a 9x13-inch metal baking dish and let it melt while the oven heats up.
Blend Ingredients: In a blender, combine the eggs, milk, flour, salt, and vanilla extract. Blend until the mixture is smooth and free of lumps, about 30 seconds.
Add Batter: Carefully pour the blended batter into the baking dish over the melted butter. Don’t worry if it looks a little bubbly; that’s part of the magic!
Bake: Slide the dish into the oven and bake for 22-27 minutes. Keep an eye on it until the edges are golden brown and the center is puffy.
Serve: Remove from oven and sprinkle generously with powdered sugar and syrup before slicing. Slice into pieces and enjoy while it's warm!