Cream together butter and 1/2c. brown sugar and white sugar until fluffy. **You can substitute 1/2 cup of Coconut Oil for 1/2 cup of butter.** Add 2 egg yolks, baking soda, flour, salt and vanilla. Mix well and spread in a 13x9 pan. Sprinkle chocolate chips and nuts on top. Beat 2 egg whites with the brown sugar and drizzle evenly over all. Bake at 375 degrees for 25 mins. Cool and cut into bars.
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