1-2-3-4 Cake With Caramel Icing

• 4 eggs well (beaten)
• 1 stick
• 400 gr sugar
• 400 gr powdered sugar well sifted
• 375 gr flour
• 350 gr butter
• 300 ml milk
• 220 gr dark brown sugar firmly packed
• 14 gr baking powder
• 4 gr pure vanilla extract