Add eggs and vanilla. Beat well.
Add flour, salt, baking powder and oatmeal. Mix well.
Spread in 2 greased 9x13" pans. Bake at 325° for 25 minutes.
For frosting, cream together peanut butter, powdered sugar and salt. Add milk to desired consistency.
Remove from oven and frost immediately with peanut butter frosting.
Let bars cool after frosting before cutting.