Preheat oven to 350°F (175°C). Line an 8x8 pan with parchment or grease it lightly.
Grate zucchini, then squeeze out the liquid with a towel or cheesecloth. Set aside.
In a bowl, whisk almond flour, cocoa, protein powder, baking powder, baking soda, and salt.
In another bowl, whisk eggs, maple syrup, almond milk, vanilla, and melted coconut oil.
Stir wet ingredients into dry. Fold in zucchini and chocolate chips. Batter will be thick.
Spread batter in the pan. Bake 25–30 minutes, until a toothpick comes out clean or with a few moist crumbs.
Let brownies cool fully in the pan to firm up.
Microwave chocolate chips with coconut oil in 30-second bursts, stirring until smooth.
Drizzle glaze over brownies. Let it set for 10–15 minutes, then slice and serve.