Preheat the oven to 350°F (180°C) and line two baking sheets with parchment paper.
Melt the butter in a small saucepan until it turns golden brown and smells nutty. Remove from heat immediately to avoid burning.
1 cup unsalted butter
In a large bowl, whisk together the browned butter, brown sugar, and granulated sugar until smooth (about 2 minutes).
1 ½ cups light brown sugar, ½ cup granulated sugar
Add the eggs, egg yolk, and vanilla, and whisk until fully combined.
2 large eggs, 1 large egg yolk, 2 ½ teaspoons vanilla extract
In a separate bowl, mix the flour, baking soda, cinnamon, salt, oats, and coconut.
2 ⅓ cups all-purpose flour, 1 teaspoon baking soda, 1 teaspoon ground cinnamon, ½ teaspoon salt, 1 ¾ cups old-fashioned oats, ¾ cup shredded coconut
Fold the dry mixture into the wet ingredients just until combined. Stir in the pecans and chocolate chips.
½ cup chopped pecans, 8 ounces semi-sweet chocolate chips
Scoop 2-inch balls of dough onto the prepared baking sheets, leaving about 2 inches of space.
Bake one sheet at a time for 12 minutes, or until the edges are golden and the centers look slightly soft.
Sprinkle with flaky sea salt, if desired. Let cool before serving.
Flaky sea salt