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Preheat oven to 375°.
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Combine butter and shortening; beat on medium to high speed for 30 seconds.
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Add brown sugar, sugar, baking soda, cinnamon (if using) and salt until blended.
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Beat in eggs and vanilla until well blended. Add flour until blended. Add in oats.
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Drop dough by rounded teaspoons 2-inches apart onto an ungreased cookie sheet.
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Bake in preheated oven for 7-9 minutes or until tops are golden. Let cookies stand on cookie sheet for 1 minute. Transfer to a wire rack;let cool.
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To store: layer cookies between waxed paper in an airtight container; cover. Store at room temperature for up to 3 days or freeze for up to 3 months.