Whisk together the flour, cocoa powder, salt, baking soda, and baking powder. Set aside.
In another bowl, whisk together the greek yogurt, maple syrup, vanilla extract, and melted butter. Whisk in the eggs.
Add the dry ingredients to the wet and stir until just combined (do not over mix).
Fold in ¾ cup of the mini chocolate chips using a rubber spatula.
Line an 8 by 8 baking dish with parchment paper. Leave enough overhang on the sides to be able to pull the cake out when it is done.
Pour the batter into the parchment paper lined pan. Top the batter with the remaining ¼ cup of mini chocolate chips.
Bake the chocolate snack cake 350 degrees for 28-32 minutes, or until a toothpick inserted comes out clean.
Allow the cake to cool 10 minutes in the pan, then remove it by pulling the parchment paper out. Cool the cake for an additional 10-20 minutes on a cooling rack, then cut it into 12 squares.