Preheat the oven to 350°F. Line 2 baking trays with parchment paper. Melt the butter and allow it to cool as you prep the rest of your ingredients.
3/4 cups unsalted butter
In a medium-sized bowl, add in flour, baking soda, baking powder, cornstarch, and salt. Stir to combine and set aside.
1 3/4 cups all-purpose flour, 1 1/2 tsp cornstarch*, 1 tsp baking soda, 1/2 tsp baking powder, 1/4 tsp salt
In a large bowl, add in melted and slightly cooled butter, oil, white sugar, and brown sugar. Whisk together until well combined (about 2-3 minutes).
3 tbsp oil*, 1/2 cup white sugar, 3/4 cups light brown sugar, 3/4 cups unsalted butter
Add in the eggs and vanilla, and continue whisking for another 2-3 minutes until paler in colour and there are some air bubbles.
2 large eggs, 1 tbsp vanilla
Mix in the dry ingredients with a spatula. Mix a few times, don't completely mix it in yet!
Add in the rolled oats and coconut and continue to mix your cookie dough until completely mixed together. Don't over-mix! Once the flour streaks are gone, stop mixing.
3/4 cups unsweetened shredded coconut, 1 1/2 cups rolled oats*
Scoop 6 cookies at a time (I did approx 2 tbsp per cookie using a cookie scooper), space them 2-3 inches apart from each other.
Bake the cookies for 11-13 minutes or until the edges are a light brown and the middles are slightly underbaked. The cookies will continue to bake from the hot pan once removed from the oven.
These coconut oatmeal cookies are so delicious! They stay good on your counter in an airtight container for 3 days, and in the fridge for up to 1 week.