Zucchini Brownies
A whole zucchini in the batter, and nobody notices it: instead, they stay moist for three days.
- Preparation
- 20 min
- Cook/bake time
- 40 min
- Total
- 2 hr
- Difficulty
- Easy
- Calories
- 204 kcal
- Servings
- 16 pieces
- Prep
- 20 min
- Cooking & baking
- 40 min
- Resting
- 1 hr
Only 1 hr of that is hands-on – the rest takes care of itself.
Moist chocolate brownies with 250 g zucchini in the batter. You cannot taste or see it, it just provides the water that keeps the crumb moist for days. One wooden spoon, one bowl, no mixer, 204 kcal per piece. The most important step is the one you skip: the zucchini is not squeezed dry.
Why this works
Zucchini consists of about 95 percent water, and exactly this water is the ingredient here, not the vegetable. That is why, unlike for zucchini fritters, it is expressly not squeezed dry: what ends up wrung out in the sink will later be missing in the crumb. The shreds only release their water in the oven, where it is bound in a sugar and starch mixture and stays inside. This is the reason why these brownies are better on the second day than on the first, whereas classic brownies dry out from day one. You cannot taste any of it. Zucchini contains hardly any sugar, no significant acid and almost no volatile flavor compounds, so it simply has nothing to compete with 50 g cocoa. It only remains visible if you grate it too coarsely; on the fine side of the grater, the cell walls break down completely during baking. The half teaspoon of baking soda helps with this: it slightly raises the pH value of the batter, which colors the cocoa darker and accelerates browning.
Step-by-step instructions
- 1
Zucchini fein raspeln
Wasch die Zucchini, schneide die Enden ab und raspel sie auf der feinen Seite der Reibe. Solange die Schale dünn und glatt ist, bleibt sie dran. Nicht ausdrücken, nicht salzen, nicht abtropfen lassen – das Wasser gehört in den Teig.
- 2
Trockenes mischen
Heiz den Ofen auf 180 °C Ober-/Unterhitze vor. Leg eine Form von 20 mal 20 cm mit Backpapier aus, das an zwei Seiten übersteht. Vermisch Mehl, Backkakao, Backpulver, Natron und Salz gründlich – Kakao klumpt sonst und löst sich im dicken Teig nicht mehr auf.
- 3
Feuchtes verrühren
Verrühr in einer zweiten Schüssel den braunen Zucker mit Öl, Eiern und Vanilleextrakt – ein Löffel genügt, hier muss nichts schaumig werden. Heb die geraspelte Zucchini unter. Die Masse wirkt jetzt ungewöhnlich nass, und das ist richtig so.
- 4
Zusammenführen, aber kurz
Gib die feuchte Masse zur trockenen und rühr nur, bis kein Mehl mehr zu sehen ist. Der Teig ist zäh – gieß trotzdem keine Milch nach, die Zucchini gibt ihr Wasser erst im Ofen ab. Zuletzt die Schokolade unterheben und alles in die Form streichen.
- 5
Backen und prüfen
Back die Brownies 35 bis 40 Minuten. Die Stäbchenprobe fällt hier anders aus als sonst: Feuchte Krümel am Stäbchen sind richtig, flüssiger Teig heißt 5 Minuten weiter.
- 6
Auskühlen lassen
Lass die Brownies vollständig in der Form auskühlen, mindestens eine Stunde. Warm geschnitten reißen sie, weil die Krume erst beim Abkühlen fest wird. Dann am überstehenden Papier herausheben und in 16 Stücke schneiden.
Our best tips
- Use the fine side of the grater, not the coarse one. Coarse shreds survive baking as visible green threads, and then the whole idea of nobody noticing the zucchini is ruined.
- Bake a day ahead. The water from the zucchini distributes itself in the crumb overnight; on the second day, the brownies are moister than fresh from the oven. This is true for hardly any other baked good.
- A large zucchini from a neighbor yields a good two baking pans. The batter can easily be doubled, and the second pan goes straight into the freezer, whole, not in cubes.
Tasty variations
Zucchini Muffins
Divide the same batter among 12 muffin cups and bake for 20 to 22 minutes. Because of the smaller shape, they dry out sooner than the baking pan, so it is better to take them out two minutes early.
Gluten-free
Replace the 180 g flour with 160 g gluten-free flour blend and 20 g ground almonds. The batter then needs 10 minutes of rest before baking so that the starches absorb the zucchini water.
Vegan
Instead of the eggs, mix 2 tablespoons of ground flaxseed with 6 tablespoons of water and let swell for 10 minutes. The zucchini brings enough moisture anyway, the crumb just becomes a little denser as a result.
As a Chocolate Zucchini Cake
Pour the same batter into a loaf pan (30 cm) and bake for 50 to 55 minutes at 170 °C. Taller means longer and lower: at 180 °C the crust would be dark before the center is done.
Nutrition facts
| Calories | 204 kcal |
|---|---|
| Protein | 3 g |
| Carbohydrates | 24 g |
| – of which sugar | 14 g |
| Fat | 10 g |
| Fiber | 2 g |
Where the 204 kcal come from
per serving
Calculated from the ingredients – how we do it
We add up reference values for every ingredient and divide by the number of servings. These assumptions are baked in:
- Reference values per 100 g – for the raw ingredient, exactly as listed.
- Tinned goods count at drained weight, bone-in meat at purchase weight: you eat about 70 per cent of a chicken thigh and leave the rest.
- Water evaporates as you cook. The energy stays in the pot, the weight does not – so the figure is per serving, not per 100 g of finished dish.
- Anything listed without a quantity – “salt and pepper” – is not counted.
A guide value, not a lab measurement: no two onions weigh the same, and fat content varies from pack to pack.
What can go wrong
The points where this recipe most often goes sideways – and what to do about it.
- The batter is so tough that I want to pour in milk
- Do not do it. A zucchini brownie batter is significantly firmer than a sponge batter, because the 250 g of shreds only release their water in the heat of the oven. Until then, it sits in the cells. Anyone who pours in liquid now brings water into the same batter twice and gets a soggy center that never bakes through.
- Green threads are visible in the slice
- Grated too coarsely. The coarse side of the grater creates strips whose cell walls survive baking; on the fine side they break down. With a very large zucchini with a firm, dark skin, both come together. You peel those beforehand, but with the usual medium-sized ones this is unnecessary.
- The center remains soggy, the edge is done
- The pan was too small, making the layer too thick. For 20 by 20 cm, 35 to 40 minutes is right. With a smaller pan, cover the brownies loosely with aluminum foil after 30 minutes and give them ten minutes more so that the center cooks through without the edge getting dark.
- The brownies turned out dry
- The zucchini was squeezed dry or salted and drained, a step from the fritter recipe that does exactly the opposite here. This batter contains no milk and no cream; the water from the zucchini is the entire liquid. Without it, about 240 g are missing, and you can taste that from the first forkful.
Frequently asked questions
Can you taste the zucchini in the brownies?
No. Zucchini contains hardly any sugar, no significant acid and almost no volatile flavor compounds, so it has nothing to counter 50 g cocoa and 120 g chocolate in terms of taste. It only becomes visible if you grate it too coarsely.
Do I have to squeeze the zucchini dry?
No, and that is the most common mistake with this recipe. The batter contains neither milk nor cream; the water from the shreds is the entire liquid. Squeezed dry, about 240 g are missing, and the brownies become dry instead of moist.
Do I have to peel the zucchini?
Not with the usual medium-sized zucchini, as the thin skin breaks down during baking. Only very large specimens with firm, dark skin and pronounced seeds should be peeled and seeded beforehand, because both remain visible.
How much zucchini is 250 grams?
About one medium-sized zucchini of around 20 cm, grated a good two cups. Being more precise than 'one zucchini' is actually worth it here, because the water in it is the liquid of the recipe. Adding 100 g too much makes the center soggy.
How long do zucchini brownies keep?
Airtight at room temperature for five days, and the first three they get better instead of worse. The water from the zucchini distributes itself in the crumb overnight. Frozen they keep for three months, ideally whole and not in cubes.
Do I really need baking powder and baking soda?
Both together, yes. The baking powder leavens, the baking soda does something else: it slightly raises the pH value, colors the cocoa darker and accelerates browning. Baking soda alone is not enough, because there is too little acid in the batter to fully activate it.
How many calories do zucchini brownies have?
Around 204 kcal per piece for 16 pieces from a 20 by 20 cm pan. For comparison, classic brownies with butter and chocolate are around 315 kcal per piece. The difference is the zucchini, which contributes liquid without significant energy.
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