Step 1

Preheat oven to 350 degrees with rack in top third. Whisk together flour, oats, baking soda, cinnamon, and salt. In a large bowl, beat butter with both sugars on medium speed until pale and fluffy. Add eggs, one at a time, beating well after each addition. Beat in vanilla. Reduce speed to low and gradually add flour mixture, beating until just incorporated. Beat in chocolate, pecans, and coconut until just combined. (Dough can be made up to this point, covered in plastic, and refrigerated up to 3 days.)

Step 2

Line baking sheets with parchment. Using a 1/4-cup ice cream scoop, drop dough onto prepared sheets, about 3 inches apart. Flatten each with palm of hand. Bake, rotating sheets halfway through, until edges of cookies begin to turn golden, 16 to 18 minutes. Transfer sheets to wire racks; let cool 5 minutes. Transfer cookies to racks; let cool completely. Cookies can be stored in airtight containers at room temperature up to 3 days.