Preheat your oven to 400°F (190°C). Line a muffin tin with paper liners or grease the cups with dairy-free cooking spray.
In a large mixing bowl, whisk together the flour, cocoa powder, sugar, baking powder, baking soda, and salt until well combined.
In a separate bowl, mix together the dairy-free milk, melted coconut oil, apple cider vinegar, and vanilla extract.
Pour the wet ingredients into the dry ingredients and mix until just combined. Be careful not to overmix; a few lumps are okay.
Fold in the dairy-free chocolate chips.
Spoon the batter into the prepared muffin cups, filling each about 2/3 to 3/4 full.Sprinkle a few extra chocolate chips on top Bake for 5 minutes at 400°F. Then lower the heat to 375°F. Bake for another 13-15 minutes at 375°F.
The muffins are done when a toothpick inserted in the middle comes out clean.
Remove the muffins from the oven and let them cool in the tin for about 5 minutes. Then, transfer the muffins to a wire rack to cool completely.