Melt margarine and chocolate in saucepan over very low heat
Remove from heat, blend and stir in sugar
Add eggs, one at a time, beating well
Add vanilla. Sift flour, baking powder and salt together and beat into chocolate mixture
Pour into a greased 9" square pan
Sprinkle nuts over top
Bake at 350 degrees for 25 minutes
Cut into squares before completely cooled
*Tip- cutting with a plastic knife will make for smoother cutting
Serving suggestion: partially freeze, and chop into small pieces, and serve over a banana split lengthwise with strawberry yogurt. Tastes just like a banana split!