Brownies

1/2 cup butter or margarine
8 oz. dark chocolate chips
1 cup sugar
2 eggs
1/4 cup mayonnaise
1 teaspoon vanilla
3/4 cup flour
1/2 teaspoon baking powder
1/4 teaspoon salt
1 cup walnuts


Melt chocolate chips in shortening over low heat, cream shortening mixture and sugar.  Add eggs, mayonnaise and vanilla, beating thoroughly.  Add flour, salt and baking powder to creamed mixture.  Stir in nuts.  Pour into well greased 8x10 inch pan.  Bake 30 to 35 minutes at 350 degrees.  Cool.  Cut into squares.