Whisk together the flour, cocoa powder, salt, baking soda, and baking powder in a mixing bowl until combined.
In a separate bowl, whisk together the greek yogurt, vanilla extract, melted butter, and maple syrup.
Whisk the eggs into the other wet ingredients.
Add the dry ingredients to the wet and mix until just combined using a rubber spatula. Do not over mix the batter.
Fold in the mini chocolate chips using the rubber spatula.
Spray a mini muffin tin with nonstick spray.
Distribute the batter into the pan, filling each mini muffin tin ¾ of the way full. The easiest way to do this is by using a mini cookie scoop. Note - this will make 1 and a half tins full of muffins, you will not use all the batter for one muffin tin. It will yield 36 mini muffins in total
Bake the mini muffins at 350°F for 12-14 minutes, until a toothpick inserted comes out clean
Cool the mini muffins 2-3 minutes in the pan, then remove them onto a wire cooling rack to cool completely