Preheat oven to 350ºF. Grease a standard muffin tin.
Start by making the crust. Mix together graham cracker crumbs, sugar, and melted butter. Spoon into muffin cups and press using the back of a 1/4 measuring cup. Bake for 5 minutes until lightly browned.
Whisk eggs and sugar. Add in coconut milk, lime juice, zest, and vanilla. Whisk to combine. Pour into cups until about 3/4 full.
Bake 18-22 minutes until set but still a bit jiggly. Cool and remove from the pan. Chill 1-2 hours in the fridge. Garnish with lime zest or toasted coconut.