Preheat oven to 350°. Line baking sheets with silicone liners or parchment paper.
Whisk together flour, baking soda, salt, and baking powder. Stir in oats. Set aside.
Using an electric mixer on medium speed, beat brown sugar and butter until light and fluffy. Add eggs, one at a time, mixing well after each addition. Mix in water and vanilla.
Reduce mixer speed to low and gradually add flour/oat mixture. Mix just until combined. Stir in coconut, chocolate chips, and pecans.
Drop dough by 2 tablespoonfuls onto prepared pans. Place cookies about 2 inches apart. Bake, one baking sheet at a time, 13-15 minutes, or until edges are lightly browned and centers are slightly soft. (Refrigerate unused dough between baking batches.)
Cool on baking sheets for 5 minutes. Then, transfer to wire rack to cool completely.
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