This high protein zucchini bread gets about 13 grams of protein per slice from Greek yogurt, oat flour, hemp seeds and walnuts. There is no protein powder, no eggs and no added sugar in it.

Most protein zucchini bread recipes rely on a scoop of whey. This one uses ingredients you can pick up at any US supermarket, mixed in two bowls and baked in one loaf pan.

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Quick recipe overview


Prep time	15 minutes
Rest time	10 minutes
Bake time	55 minutes
Cooling time	1 hour 30 minutes
Total time	2 hours 50 minutes
Yield	1 loaf (8×4 inch), 8 thick slices
Calories	about 310 per slice
Protein	about 13 g per slice
Diet	Vegetarian, egg-free, no added sugar, no protein powder

Why you’ll love this recipe

High protein without powder. About 13 g per slice from everyday foods.
No eggs. Greek yogurt and ground flaxseed hold the loaf together.
No added sugar. It is sweetened with monk fruit sweetener.
Oat flour instead of white flour. You can blend your own from rolled oats.
Two bowls, one pan. No mixer needed.
Freezer friendly. Slice it, freeze it, and toast a slice when you want one.

Ingredients

Zucchini, 1 1/2 cups grated and squeezed (1 medium, about 7 oz / 200 g before squeezing). Leave the skin on. It is tender and gives the green flecks. Small or medium zucchini work best because large garden zucchini are watery and seedy.

Plain Greek yogurt, 1 1/4 cups (300 g). The main protein source and the replacement for eggs and most of the fat. Buy plain, unsweetened, thick Greek yogurt. Nonfat or whole both work, and whole gives a softer crumb.

Oat flour, 2 1/4 cups (225 g). Weigh it if you can, because oat flour packs differently cup to cup. To make your own, blend rolled oats until fine and then measure.

Smooth almond butter, 1/4 cup (64 g). Adds protein, fat and a mild nutty flavor. Use the natural, drippy kind with no added sugar. Peanut butter works and tastes stronger.

Avocado oil or melted butter, 2 tablespoons. Keeps an all-oat loaf from turning dry. Any neutral oil is fine.

Granulated monk fruit sweetener, 1/2 cup (96 g). Use a 1:1 sugar replacement blend, such as the monk fruit and erythritol bags sold in the baking aisle.

Milk, 1/4 cup (60 ml). Loosens the batter. Any milk works.

Hemp seeds (hemp hearts), 1/4 cup (40 g). A quiet protein boost. Find them near the chia and flax.

Chopped walnuts, 1/2 cup (58 g). Classic in zucchini nut bread. Pecans are an easy swap.

Ground flaxseed, 2 tablespoons (14 g). Helps bind the loaf without eggs.

Vanilla extract, 2 teaspoons. The main flavor here, since this loaf has no cinnamon.

Baking powder 1 1/2 teaspoons, baking soda 1/2 teaspoon, salt 1/4 teaspoon.

Equipment

8×4-inch loaf pan
Parchment paper
Box grater
Clean kitchen towel or cheesecloth
Two mixing bowls and a whisk
Kitchen scale (recommended for the oat flour)
Wire cooling rack

How to make high protein zucchini bread

Heat the oven and prep the pan. Heat the oven to 350°F (175°C). Line an 8×4-inch loaf pan with parchment, leaving an overhang on the long sides so you can lift the loaf out.
Grate and squeeze the zucchini. Grate the zucchini on the large holes of a box grater. Pile it into a clean towel and wring it hard over the sink until almost no liquid drips. You should have 1 1/2 cups of dry shreds.
Whisk the wet ingredients. In a large bowl, whisk the Greek yogurt, almond butter, oil, monk fruit sweetener, milk and vanilla until smooth, with no streaks of almond butter.
Whisk the dry ingredients. In a second bowl, whisk the oat flour, ground flaxseed, baking powder, baking soda and salt.
Combine. Add the dry mixture to the wet and fold just until no dry flour shows. Fold in the zucchini, walnuts and hemp seeds. The batter will be thick, closer to a soft cookie dough than a pourable cake batter. If it is too stiff to spread, add 1 tablespoon of milk.
Rest for 10 minutes. Scrape the batter into the pan, smooth the top and let it sit. This gives the oat flour and flaxseed time to absorb moisture.
Bake for about 55 minutes. The loaf is done when the top is deep golden and a toothpick in the center comes out clean. If the top browns quickly, tent it loosely with foil after 35 minutes.
Cool completely. Cool in the pan for 15 minutes, lift the loaf out by the parchment, then cool fully on a rack, about 1 hour 15 minutes more. An egg-free oat loaf is fragile while warm and firms up as it cools.

Tips for the best zucchini bread

Squeeze the zucchini harder than feels necessary. Extra water is the main reason zucchini bread turns gummy.
Weigh the oat flour. 225 g is the target. Scooped cups can run heavy and dry the loaf out.
Use thick Greek yogurt. If liquid has pooled on top, pour it off first.
Stir the almond butter in its jar. Oily almond butter from the top or dry paste from the bottom both change the batter.
Do not skip the rest. Ten minutes lets the oat flour hydrate so the crumb sets instead of crumbling.
Slice only when fully cool. A serrated knife and a gentle sawing motion give clean slices.

Common mistakes

Problem	Why it happens	Fix
Gummy or wet center	Zucchini not squeezed dry, or loaf underbaked	Wring the zucchini until it barely drips. Bake until a toothpick from the center is clean, adding 5 to 10 minutes if needed
Loaf sinks in the middle	Taken out too early, or oven door opened in the first 30 minutes	Keep the door closed and test the center, not the edge
Dry, crumbly slices	Too much oat flour, or sliced warm	Weigh the flour and cool completely
Top too dark before the center is done	Oven runs hot or pan sits too high	Tent with foil after 35 minutes and bake on the middle rack
Bitter or soapy taste	Too much baking soda, or not mixed in evenly	Level the 1/2 teaspoon and whisk the dry ingredients well

Substitutions

Ingredient	Substitute	Effect	Recommended
Almond butter	Smooth peanut butter, same amount	Stronger peanut flavor	Yes
Almond butter	Sunflower seed butter, same amount	Removes the almond. Can tint the crumb green as it reacts with baking soda, which is harmless	Yes, if avoiding almonds
Walnuts	Pecans, same amount	Slightly sweeter	Yes
Hemp seeds	More chopped walnuts or sunflower seeds	Lower protein per slice	Yes
Avocado oil	Melted butter, olive oil or any neutral oil	Little change	Yes
Milk	Any unsweetened plant milk	Little change	Yes
Oat flour	Certified gluten-free oat flour	Makes the loaf gluten-free	Yes
Monk fruit sweetener	Granulated sugar or coconut sugar, same amount	Works, but the loaf is no longer free of added sugar	Only if that is fine for you
Greek yogurt	Regular yogurt	Too thin. Strain it through cheesecloth first	Not as is
Oat flour	Almond or coconut flour	Absorb liquid very differently and are not a 1:1 swap	No

Variations of High Protein Zucchini Bread

These are starting points and have not been tested with this exact formula.

Cinnamon zucchini bread: add 1 1/2 teaspoons ground cinnamon to the dry ingredients for the classic flavor.
Lemon zucchini bread: add the zest of 1 lemon and 1 tablespoon lemon juice, and reduce the milk by 1 tablespoon.
Chocolate chip zucchini bread: replace half the walnuts with 1/4 cup sugar-free chocolate chips.
Chocolate zucchini bread: add 3 tablespoons unsweetened cocoa powder and 1 extra tablespoon of milk.
Zucchini bread muffins: divide the batter into a lined 12-cup muffin pan and start checking for doneness at 20 minutes.

Storage

Refrigerator: because the loaf is moist and yogurt-based, store it in an airtight container in the fridge. [NEETU: confirm how many days it kept well for you.]
Freezer: slice the cooled loaf, separate slices with parchment, and freeze in a freezer bag.
Thawing: thaw a slice at room temperature, or toast it straight from frozen.

Make-ahead and meal prep

Bake the loaf on the weekend, slice it once cool, and freeze the slices individually. Pull one out the night before, or toast it in the morning.

Serving suggestions

Toasted, with a spoonful of Greek yogurt and berries
With almond or peanut butter for extra protein
Next to coffee as a breakfast bread
Packed as an afternoon snack

Nutrition information of High Protein Zucchini Bread

Per slice, with the loaf cut into 8 slices.

Nutrient	Per slice
Calories	about 310
Protein	13 g
Carbohydrates	25 g
Total fat	19 g
Saturated fat	2 g
Fiber	4 g
Sugar	3 g
Added sugar	0 g
Sodium	about 270 mg

Assumptions: plain nonfat Greek yogurt, unsalted natural almond butter, 2% milk, avocado oil, and oat flour at 225 g. The erythritol in the monk fruit sweetener is not counted in carbohydrates. Cut into 10 slices, each has about 250 calories and 10.5 g protein.

Nutrition information is an estimate and may vary depending on the brands and ingredients used.

What the numbers mean

Protein: about 30 g comes from the Greek yogurt and about 33 g from the oat flour, with the rest from almond butter, hemp seeds and walnuts.
Fiber: mostly from oat flour, flaxseed and nuts.
Sugar: the 3 g per slice occurs naturally in yogurt, milk and zucchini. None is added.
Fat: mostly unsaturated, from nuts, seeds and avocado oil.

FAQ

How much protein is in this zucchini bread? About 13 g per slice when the loaf is cut into 8 slices, based on standard nutrition values.

How is it high protein without protein powder? The protein comes from Greek yogurt, oat flour, almond butter, hemp seeds and walnuts.

Is this zucchini bread made without eggs? Yes. Greek yogurt and ground flaxseed bind the loaf.

Is it gluten-free? Only if you use certified gluten-free oat flour and check that your baking powder is gluten-free. Regular oats are often processed alongside wheat.

Do you peel zucchini for bread? No. The skin is thin, softens as it bakes, and gives the loaf its green flecks.

Do I really need to squeeze the zucchini? Yes, for this recipe. The batter already gets plenty of moisture from the yogurt.

Why is my zucchini bread gummy in the middle? Usually the zucchini was too wet or the loaf needed more time. Squeeze harder and bake until a toothpick from the center comes out clean.

Can you freeze zucchini bread? Yes. Freeze cooled slices with parchment between them so you can take out one at a time.

Can I use frozen shredded zucchini? Thaw it completely and squeeze it very dry first, since frozen zucchini releases more water.

Can you taste the zucchini? Zucchini is mild and mostly adds moisture and color rather than flavor.

Can I use regular sugar instead of monk fruit? Yes, in the same amount. The bread will then contain added sugar.

Can I use almond flour instead of oat flour? Not as a direct swap. Almond flour holds much less liquid, so the amounts would need to change.

Final thoughts about High Protein Zucchini Bread

If you want a healthy zucchini bread that brings real protein without a tub of protein powder, this loaf is worth a spot in your rotation. It uses ingredients you may already have, and it freezes well for busy mornings.