Step 1- Make the Flax Egg First (15 Minutes, Passive)
Combine 4½ teaspoons of ground flaxseed with ¼ cup + 1½ teaspoons of water in a small bowl. Whisk together and set aside for 15 minutes to gel. This is your egg replacement the gel that develops as the flaxseed absorbs water binds the batter exactly the way eggs would in conventional muffin batter. Don't rush this step; an under-gelled flax egg won't bind effectively and the muffins may crumble.
While the flax egg sets, preheat your oven to 350°F, line your muffin tin with parchment liners, and measure out all remaining ingredients.
Step 2- Whisk the Dry Ingredients
Add the oat flour, baking soda, baking powder, cinnamon, and salt to your medium bowl and whisk until evenly combined. Pre-mixing the dry ingredients ensures the leaveners distribute evenly throughout the flour which means consistent rise in every muffin rather than some puffing dramatically and others staying flat.
Step 3- Whisk the Wet Ingredients
In your large bowl, whisk together the melted coconut oil, coconut sugar, maple syrup, gelled flax egg, and vanilla extract until smooth and uniform. The coconut oil should be fully melted but not hot if it's too warm when you add the flax egg, it can partially cook the gel and reduce its binding effectiveness. Room-temperature melted coconut oil is ideal.
Step 4- Combine Wet and Dry
Add the dry ingredients to the large bowl of wet ingredients and whisk until just incorporated until no visible flour streaks remain. Stop immediately once combined. Do not overmix gluten-free oat flour is more sensitive to overmixing than conventional flour, and overworked batter produces dense, gummy muffins instead of light, tender ones.
The batter will look noticeably thick at this stage. That's correct and expected don't add extra liquid to thin it. The zucchini releases significant moisture during baking that hydrates the batter from within.
Step 5- Fold In the Zucchini and Chocolate Chips
Add the grated zucchini to the batter and fold and mash it in thoroughly using a rubber spatula about 1 full minute of active folding ensures the zucchini integrates completely rather than sitting in distinct pockets. The batter thickens further as the zucchini incorporates. This is very thick batter it behaves more like a dough than a typical muffin batter, and that's exactly right.
Once the zucchini is fully incorporated, fold in the ¾ cup of vegan chocolate chips and optional chopped walnuts with two or three gentle passes of the spatula.
Step 6- Fill the Muffin Cups
Use an ice cream scoop to drop batter evenly into the lined muffin cups. For 8 tall-domed muffins, fill each cup completely with a slight mound above the rim. For 12 medium-domed muffins, fill each cup ¾ full. Optionally scatter extra chocolate chips and walnut pieces over the tops of each muffin before baking this creates that bakery-perfect top with visible chocolate and visible crunch.
Step 7- Bake for 24–32 Minutes
Slide the tin into the preheated oven. Baking time varies with quantity:
8 muffins- approximately 28–32 minutes
12 muffins- approximately 24–27 minutes
Test doneness with a toothpick at the lower end of the time range it should come out clean with just a few moist crumbs attached. Wet batter means more time; clean with crumbs means done. Don't overbake these muffins are intentionally moist and a dry toothpick often means they've gone past their peak.
