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Whisk flour, baking soda and salt together; Set Aside.
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Cream the sugar, butter, shortening, eggs and vanilla together.
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Stir Flour Mixture into Creamed mixture.
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Then Stir in chocolate chips.
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Form cookies and bake.
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Preheat oven to 350°F degrees.
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Whisk dry ingredients, set aside.
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Combine wet ingredients with a hand mixer on low.
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To cream, increase speed to high and beat until fluffy and the color lightens.
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Stir the flour mixture into the creamed mixture until no flour is visible.
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(Over mixing developes the gluten, making a tough cookie).
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Now, stir in the semi-sweet and milk chocolate chips.
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Use a cookie scoop (2 tbs per scoop) to measure and drop dough 2" apart onto an ungreased baking sheet.
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Bake on center rack of oven 12-14 minutes, until lightly browned and edges are set.
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Remove from oven; leave cookies on baking sheet for 2 minutes to firm up.
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Transfer to a wire rack to cool.
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If you are reusing the warm baking sheet, reduce baking time slightly.