Preheat oven to 400°F (200°C).

Place a 9x13 inch baking pan in the oven.

Add butter to the pan and let it melt in the preheating oven.

In a mixing bowl, combine eggs, milk, flour, sugar, and salt.

Whisk until the batter is smooth.

Carefully remove the hot pan from the oven.

Pour the batter into the melted butter in the pan.

Bake for 15-20 minutes, or until the edges are brown and the pancake is fluffy.

Remove from the oven and let cool slightly.

Serve immediately, topped with powdered sugar or maple syrup.