Preheat the oven to 350°F and line an 8-inch square pan with parchment paper.
Mix the eggs, vanilla, coconut sugar, and applesauce in a large bowl, then let the mixture stand for 5 minutes so the sugar begins to dissolve.
In a separate bowl, whisk the flour, Dutch-process cocoa, baking soda, and salt until no cocoa lumps remain.
Gently stir the dry mixture into the wet ingredients just until combined, then fold in the grated zucchini and 1 cup of chocolate chips.
Spread the batter evenly in the prepared pan and scatter the mini chocolate chips over the top.
Bake for 20 to 30 minutes, until a toothpick is sticky but no longer coated with raw batter. Cool before cutting into sixteen squares.
Notes
Recipe facts extracted from the source Recipe JSON-LD; the canonical blueprint uses the primary coconut-sugar version and retains the source's 20-to-30-minute visual doneness window within its stated 35-minute cook allocation.