Preheat the oven to 350℉ and prepare your 8" cake pan(s) with pan spray and lined with parchment paper.
If you haven't done so yet, toast the coconut evenly (don't forget to toast more than what was weighed if you want to garnish with it!). Check and stir it frequently to prevent it from burning. Allow to cool before using.
Using your stand mixer and paddle or hand mixer and beaters, cream together the butter and sugar on medium speed until light and fluffy. Scrape down the sides of the bowl and attachment.
Lower to speed to medium-low, and add in the eggs. Mix until combined and scrape down the sides of the bowl and attachment.
Alternately, add in the dry ingredients and coconut milk starting and ending with the dry ingredients (dry, wet, dry, wet, dry). Mix on low speed until a dough a batter comes together.
Fold in the toasted coconut, and divide between your cake pans with about 600g each. If you don't have three cake pans, you will need to bake them one or two at a time.
Bake at 350*F for 20-25 minutes or until the center when pushed springs back up. Allow to cool completely before wrapping and cooling in the fridge until cold. If you did not have three cake pans, re-spray and line the cake pan, and bake again.