Divide batter between two ungreased 8" x 11" baking pans. Sprinkle extra raisins and nuts on top of batter if you like.
Bake at 350*F for 30 minutes or until toothpick or chopstick comes out clean. Cool in pans and then cut into squares.
Notes
These will last for up to 5 days in an airtight container. If it is warm where you are, you might store them in the fridge to avoid any mold. Be aware that the fridge will sometimes dry out cake.