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Preheat oven to 350°F and line an 8-inch metal pan with parchment paper.
In a large bowl, cream together the butter and brown sugar until light and fluffy. Mix in the egg and vanilla extract.
Stir the flour, baking powder, salt, and cinnamon into the wet ingredients just until combined. Fold in the oats and chocolate chips.
Press the dough evenly into the prepared pan. Bake on the middle rack until the edges are tan and center is mostly set (about 20-25 minutes).