Preheat your oven to 350°F (175°C). Line a muffin tin with parchment liners or grease it lightly to prevent sticking.
In a large mixing bowl, whisk together the 3 large eggs, 2/3 cup of full-fat canned coconut milk, 1/2 cup of avocado oil, and 2 teaspoons of pure vanilla extract until the mixture is smooth and well combined.
In a separate bowl, combine the 3 cups of finely ground almond flour, 1/2 cup of coconut sugar, 1/2 cup of matcha powder, 1 teaspoon of baking soda, and 1/2 teaspoon of sea salt. Whisk these dry ingredients together to eliminate any lumps, especially from the matcha.
Gradually add the dry mixture into the wet ingredients, using a rubber spatula to fold everything together gently. Be careful not to overmix; a few lumps are perfectly fine.
If you’re using chocolate chips, fold them into the batter now. This step is optional but highly recommended for a sweet contrast to the earthy matcha flavor.
Scoop the batter into the prepared muffin tin, filling each cup about 3/4 full. Bake in the preheated oven for 18-22 minutes, or until a toothpick inserted into the center comes out clean.
Once baked, remove the muffins from the oven and allow them to cool in the tin for about 5 minutes before transferring them to a wire rack to cool completely. Enjoy these matcha muffins warm or at room temperature!