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In a large bowl, stir together the oats, flour, baking soda, baking powder, salt and cinnamon.
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In a separate bowl, blend the butter and sugars with an electric mixer until smooth, about 2 minutes.
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Add the eggs and continue to beat until fluffy, about 1 1/2 minutes.
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Blend in vanilla.
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Using a wooden spoon, stir the dry mixture into the butter mixture one half at a time.
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Mix in the chocolate chips and walnuts.
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Refrigerate the dough for 1 to 2 hours.
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Heat oven to 350°F.
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Line a large baking sheet with foil, then grease the foil.
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Using a cookie scoop, or ice cream scoop, shape the dough into balls and place them on the sheet about 2 inches apart.
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Use your fingers to flatten each ball to 1/3 inch thick.
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Bake 13 to 14 minutes.