Preheat the oven to 350 F. Mix together eggs, sugar, salt, oil, vanilla and baking powder. Add in half of the flour, milk and the rest of the flour.
Pour into a greased jelly roll pan. Bake for 15-30 minutes. Check for doneness with your finger. Let cool for 1 minute then spread the peanut butter over the cake. Refrigerate until peanut butter is firm. Spread melted chocolate over peanut butter and score immediately.
Refrigerate until chocolate is firm. Cut into squares and store in a airtight container.