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Preheat oven to 375 degrees F.
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In a large bowl, beat together butter and sugars until fluffy and light in color. Add eggs and vanilla; mix to combine.
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In a medium bowl, add flour, baking soda, baking powder, and cinnamon. Add flour mixture to butter mixture in two additions, mix until just combined each time.
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Stir in rolled oats and chocolate chips.
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Drop dough by tablespoonfuls onto a Sil-Pat lined cookie sheet (or ungreased cookie sheet). Bake for 8 to 10 minutes {mine were good at 8min 30 seconds} or until edges are golden. Cool for 2 minutes; then remove to wire rack and cool completely.