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1. Mix butter, sugar, salt and vanilla.
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2. Add whole egg and egg white and mix well.
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3. Then add the flour, baking powder and hazelnuts.
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4. Stir well until a dough forms. If it's really sticky, add up to a few more tablespoons of flour until the dough is slightly sticky, but still handleable. Handleable? Is that even a word? I didn't need any extra flour today, maybe because it's so dry, humidity-wise.
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5. Form dough into a long log about 3/4 inch high, 2 1/2 - 3 inches wide and probably 15 inches long. Brush the top of the log with yet another egg white, beaten.
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6. Bake in a preheated 350F oven for 30 - 35 minutes.
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Remove from oven and after only a couple minutes gently lift the log off the pan and onto a cutting surface.
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7. With a large knife, cut into bars about 1/2 inch thick (mine were a little thicker, it's up to you) using one swift chop down, just like you would cut through celery.
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8. Place the bars cut side up back onto the cookie sheet and return to the oven. Turn temp down to 325F and bake for 20 more minutes.
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Remove from the oven and let cool completely before storing. Enjoy!