Preheat
oven to 375 degrees F. Combine flour, salt, baking soda,
baking powder and spices.
In
mixer bowl, cream together butter and brown sugar. Beat
in eggs.
Remove
beaters. Fold in the flour mixture in thirds, alternately
with milk and vanilla, until smoothly blended. Don't
overstir.
Spread
batter in a greased 9 inch square pan. Bake for 25 to
30 minutes, until top of cake springs back when touched
lightly. Cool.