Preheat the oven to 350 degrees F. Grate the zucchini and squeeze dry with paper towels and pack into a measuring cup.
Melt the butter and mix together with the zucchini, eggs, and sweetener.
Once mixed add in the vanilla, milk, and salt. Stir again to combine.
Now add the baking powder and coconut flour. Whisk or stir well until there are no coconut flour clumps and the batter has thickened. Stir in optional chocolate chips.
Pour the batter into a silicone muffin pan or a lined muffin tin. Bake for 30- 35 minutes, or until a toothpick comes out clean.