all purpose flour
Mix margarine & brown sugar in a large sauce pan. Melt over low heat. Cool mixture completely.
Add eggs...one at a time; beating well after each.
Add flour, baking powder & salt. Mix well.
Stir in nuts and vanilla.
Pour into a greased and floured 13x9 inch pan (I like to use a springform pan)
Bake in 350' oven for 25-30 minutes or until toothpick comes out clean.