In a large, microwave safe mixing bowl, melt the butter in the microwave for 1 minute. The butter will be mostly melted with a few solid pieces in the melted butter. Cool the butter in the fridge for about 15 minutes.
1 cup (226 g) unsalted butter
In another bowl whisk together the flour, baking soda, and salt until well combined.
2¼ cup (270 g) all purpose flour, ¾ teaspoon baking soda, 1 teaspoon salt
Remove the large mixing bowl from the fridge. Whisk the cooled melted butter, sugar and light brown sugar until smooth well combined. Whisk in the egg, egg yolk and vanilla extract until smooth and well combined.
1 cup (200 g) granulated sugar , ¾ cup (150 g) light brown sugar , 1 large egg, room temperature, 1 large egg yolk, room temperature, 2 teaspoons (10 ml) vanilla extract
Stir the dry ingredients into the wet until just combined. Gently fold in the old fashioned oats and shredded coconut until just combined.Cover the cookie dough and transfer to the fridge to chill for 30 - 60 minutes while the oven preheats. 2 cups (160 g) old fashioned or rolled oats , 1 cup (120 g) shredded coconut
Preheat the oven to 375 F (190 C) for about 30 minutes before baking the cookies. Line a large baking sheet with parchment paper. Using a medium cookie scoop (2 tablespoons, 30 ml), scoop the oatmeal and coconut cookie dough into balls and place them onto the lined baking sheet about 3 inches (8 cm) apart. These cookies will spread a bit while baking. Bake the chewy coconut and oatmeal cookies at 375 F (190 C) for 10 - 12 minutes or until the edges of the cookies are set and are a light golden brown. The center of the cookies will be slightly puffed up. As son as the cookie come out of the oven, reshape the cookies using a biscuit or cookie cutter slightly wider than the cookie. Place the cutter over the cookies so the edges of the cookie are inside the cookie/ biscuit cutter. In a circular motion, gently nudge the edges back into a round shape. Cool the chewy coconut oat cookies on the baking sheet for 5 minutes. Then transfer the cookies to a cooling rack to cool completely to room temperature and enjoy.