Preheat the oven to 350°F. Line 2 baking trays with parchment paper. Melt the butter and allow it to come back to room temperature as you prep the rest of your ingredients.
1 cup unsalted butter
In a medium-sized bowl, add in flour, baking soda, baking powder, cornstarch, and salt. Stir to combine and set aside.
2 cups all-purpose flour, 1 tbsp cornstarch*, 1/4 tsp salt, 1 tsp baking soda, 1 1/4 tsp baking powder
In a large bowl, add in melted and slightly cooled butter, white sugar, and brown sugar. Whisk together until well combined (about 2-3 minutes).
1/2 cup white sugar, 1/2 cup dark brown sugar, 1 cup unsalted butter
Add in the egg, egg yolk, and vanilla, and continue whisking for another 2-3 minutes until lighter in colour and smooth.
1 large egg, 1 large egg yolk, 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 butterscotch chips and coconut and continue to mix your cookie dough until completely mixed together. Don't over-mix! Once the flour streaks are gone and everything is evenly combined, stop mixing.
3/4 cups butterscotch chips, 1 cup unsweetened shredded coconut
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 12-15 minutes or until the edges are baked and the middles are slightly underbaked to the touch. The cookies will continue to bake from the hot pan once removed from the oven.
These coconut butterscotch 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. I'm obsessed with them!!!