Instructions: Preheat oven to 350 F. Mix shortening, sugar, 1/2 cup of brown sugar, egg yolks, baking soda, vanilla, flour, salt, and peanut butter until it forms a stiff dough. Pat into the bottom of a greased and floured 9 x 13 inch baking pan. Spread chocolate chips over the dough. Beat the egg whites until stiff, then add 1 cup of brown sugar and beat well. Spread over the chips. Bake 20 minutes. Cool and cut into squares.

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