Pumpking Bars

3/4 c flour
3/4 t salt
1/2 t baking soda
1/2 t nutmeg
1/2 t cinnamon
2 egs
1 c brown sugar
2/3 c pumpkin
1/4 c cooking oil

frosting:
1 stick butter
8 oz cream cheese
1 t vanilla
1 box powdered sugar