In a large bowl combine brown sugar and melted oleo. Let it cool for a few minutes. Add the eggs and beat together. Add the flour and baking powder and stir. Add the chocolate chips and vanilla. Stir together well.
Grease and flour a 9x13 pan. Bake at 350 degrees for at least 30 minutes. Test with a wooden toothpick. Let cool. Cut into squares and serve. Serves approximately 20.
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