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Using a stand mixer fitted with the paddle attachment, cream together the butter, granulated sugar, and brown sugar on medium speed for about 5 minutes, or until the mixture is light and fluffy.
Stop the mixer a few times and use a rubber spatula to scrape the sides and bottom of the bowl and the paddle to release any clinging butter or sugar. Beat in the eggs and vanilla on medium speed for 2 to 3 minutes, or until thoroughly combined. Scrape the bowl and the paddle again to make sure the eggs are thoroughly incorporated.
In a medium bowl, stir together the flour, oats, baking soda, and salt. Add the chocolate, pecans, and coconut and toss to combine. On low speed, slowly add the flour mixture to the butter-sugar mixture and then mix just until the flour mixture is totally incorporated and the dough is evenly mixed.
Bake for 15 minutes, or until the cookies are golden brown on the edges and slightly soft in the center. Let the cookies cool on the baking sheet on a wire rack for 15 to 20 minutes, or until they are cool enough to remove with a spatula. Then transfer the cookies to the wire rack to cool completely, or enjoy them warm.
Adapted from Joanne Chang's Flour cookbook