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Preheat oven to 350 degrees. Line large cookie sheet with parchment paper.
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Combine flour, baking powder, baking soda, cinnamon and salt in a bowl. Whisk ingredients together. Set aside.
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Using an electric mixer, beat the butter and both sugars until creamy.
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Slowly add one egg at a time to the butter and sugar mixture, beating after each addition.
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Add vanilla beating to incorporate with the butter, sugar, and egg mixture.
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Slowly add the flour mixture, one cup at a time, stirring to combine after each addition.
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Mix in the chocolate chips, stirring to add.
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Next, add the white chocolate chips, stir well to mix.
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Add in the peanut butter chips, stir well. Add both oatmeal and walnuts continue to stir to mix well.
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Using a ¼ cup, scoop out the cookie dough and place on the lined cookie sheet allowing space for baking between each cookie.
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Bake the cookies for 15 minutes or until the edges of the cookies are lightly brown.
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Remove from oven allowing to cool slightly before transferring the cookies to a wire rack to cool completely.
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Once each cookie is cool use your black decorating icing to glue on the candy eyes.
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Next, outline the mouth and fill it in with the rest of the black decorating icing.
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Set aside to allow the icing to dry.