Step 1

Preheat oven to 350 degrees F. Coat a 9- x 13-inch baking dish with cooking spray.

Step 2

In a large bowl, beat eggs and sugar until light and fluffy. In a medium bowl, combine flour, baking powder, and salt, then gradually beat into egg mixture.

Step 3

In a small saucepan over low heat, heat milk and butter until butter is melted. Gradually add to batter, beating until combined. Stir in vanilla. Pour mixture into baking dish.

Step 4

Bake 30 to 35 minutes, or until toothpick inserted in center comes out clean. Let cool completely.