Preheat the oven to 350°F. Grease and flour an 8-inch square baking pan.
In a large mixing bowl beat the eggs till frothy.
Add the sugar and beat on high 3 minutes.
On low speed beat in the flour, baking powder and salt until just combined.
In a small saucepan on medium-high heat the milk and butter together to boiling. Add to the bowl, beating on low speed until fully combined.
Pour the batter into the prepared pan and bake 30 minutes, until a toothpick comes out clean from the center. Cool on wire rack 10 minutes.