Zucchini Walnut Coffee Cake

A giant, baseball-bat-sized squash sitting on the counter for three days is exactly what led to this zucchini walnut coffee cake. Pawning it off on neighbors never worked, so desperation eventually drove a full baking session instead. This zucchini coffee cake recipe became a way to eat vegetables for breakfast while still consuming a respectable amount of brown sugar.

Adding chopped nuts the second time turned this into a genuine zucchini walnut coffee cake, and that small change made an entire kitchen mess feel like a real accomplishment. Having life together still feels far off, but at least there’s cake. Here is exactly how I do it.

Why You’ll Love This Recipe

• Sneaky veggies. Garden produce disappears into breakfast before nine in the morning, tricking picky eaters and adults alike.
• Forgiving batter. This summer zucchini coffee cake is virtually impossible to dry out thanks to the sour cream and squash.
• Pantry friendly. All these spices and flours probably already sit in the back of the cupboard.
• Feeds an army. A large tube pan produces plenty of slices, which matters since nobody can be trusted alone with a whole cake.

Tools You’ll Need

Nothing fancy, I promise.

• 10-inch fluted tube pan – Because we are making a zucchini streusel coffee cake upside down, and this pan makes it look intentional.
• Box grater. This handles the shredding, so watch the knuckles carefully.
• Mixing bowls. Two bowls handle the wet and dry ingredients separately.

Ingredients

Crumb Topping

• 1/3 cup packed brown sugar – Dark or light, whatever you have that hasn’t turned into a literal brick.
• 1/4 cup all-purpose flour – Just the standard stuff to bind the crumble.
• 1/4 cup quick-cooking oats – Adds a nice chewy texture to the topping.
• 2 tablespoons butter, softened – Do not melt it, or your crumble will turn into a greasy paste.
• 1/2 teaspoon ground cinnamon – For that classic coffee cake warmth.

Batter

• 1-1/2 cups quick-cooking oats – Blends into the background but gives the cake a hearty structure.
• 1 cup all-purpose flour – The reliable base of our batter.
• 3/4 cup whole wheat flour – Whole wheat flour adds a slightly nutty flavor that pairs beautifully with the squash.
• 1-1/4 teaspoons ground cinnamon – Because a half teaspoon is never enough.
• 1 teaspoon baking powder – Check the expiration date so your cake actually rises.
• 1 teaspoon baking soda – Works with the sour cream to give it lift.
• 1/2 teaspoon salt – Balances out all that brown sugar.
• 1/4 teaspoon ground nutmeg – Grate it fresh if you are feeling fancy, or use the jar from 2019.
• 1/3 cup butter, softened – Again, softened, not a puddle from the microwave.
• 1 cup packed light brown sugar – Keeps the cake incredibly moist.
• 1-1/2 teaspoons vanilla extract – Measure with your heart, but a teaspoon and a half is the official rule.
• 2 large eggs – Room temperature if you remember, straight from the fridge if you are me.
• 1/3 cup reduced-fat sour cream – Full fat works too, do whatever makes you happy.
• 2-1/2 cups shredded zucchini – About two medium ones. No need to peel them!
• Confectioners’ sugar – Just a dusting at the end to hide any imperfections.

How To Make Zucchini Walnut Coffee Cake

Do not let the separate bowls scare you away; it is mostly just dumping things and stirring.

1. Prep the pan: Preheat your oven to 350°. Coat a 10-inch fluted tube pan with cooking spray, then dust it lightly with flour. Do not skip the flour dusting unless you enjoy prying cake out of a pan with a butter knife and crying.
2. Make the crumb topping: Mix the brown sugar, flour, oats, butter, and cinnamon with a fork until it gets nice and crumbly. This is your zucchini crumb cake topping; if you eat half of it raw, I will not judge, just sprinkle whatever is left into the bottom of the pan.
3. Mix the batter: Whisk the dry ingredients in one bowl, and cream the butter and sugar in another before adding the eggs and vanilla. Alternate adding the dry mixture and sour cream to the wet bowl, then fold in the zucchini. The batter will be insanely thick before the squash goes in, so do not panic and add water, the zucchini brings all the moisture you need.
4. Bake and cool: Pour the batter over the crumb mixture and bake for 35 to 40 minutes until a toothpick comes out clean. Cooling it in the pan for exactly 10 minutes is mandatory, otherwise you will have a delicious, fragmented mess on your wire rack.

Make it yours

• Chocolate chip version. You fold mini chocolate chips into the batter alongside the zucchini for a sweeter twist.
• Orange zest version. You add a teaspoon of orange zest to the batter for a bright citrus note against the spices.

Perfect Pairings

This zucchini streusel coffee cake suits two specific pairings particularly well.

• A massive mug of dark roast coffee balances out the sweet streusel.
• A relaxed Sunday brunch calls for exactly this kind of impressive-looking bake without much effort.

Zucchini Coffee Cake

This zucchini walnut coffee cake proves that an overwhelming garden harvest can turn into a genuinely impressive breakfast bake. This zucchini coffee cake recipe layers a chewy oat crumble over a moist, spiced squash batter, delivering everything a proper zucchini streusel coffee cake should taste like. Whether served for a relaxed Sunday brunch or sliced as an afternoon snack, this summer zucchini coffee cake earns a permanent spot in the seasonal baking rotation.

Print Recipe Pin Recipe

Prep Time 25 minutes mins

Cook Time 35 minutes mins

Total Time 1 hour hr

Servings: 16 servings

Course: Breakfast, Coffee Cake

Cuisine: American

Calories: 223

Ingredients Equipment Method Notes

Ingredients

  

• 1/3 cup packed brown sugar
• 1/4 cup all-purpose flour
• 1/4 cup quick-cooking oats
• 2 tablespoons butter softened
• 1/2 teaspoon ground cinnamon
• BATTER:
• 1-1/2 cups quick-cooking oats
• 1 cup all-purpose flour
• 3/4 cup whole wheat flour
• 1-1/4 teaspoons ground cinnamon
• 1 teaspoon baking powder
• 1 teaspoon baking soda
• 1/2 teaspoon salt
• 1/4 teaspoon ground nutmeg
• 1/3 cup butter softened
• 1 cup packed light brown sugar
• 1-1/2 teaspoons vanilla extract
• 2 large eggs
• 1/3 cup reduced-fat sour cream
• 2-1/2 cups shredded zucchini (about 2 medium)
• Confectioners’ sugar

Equipment

• 10-inch fluted tube pan
• Box grater
• Mixing bowls

Method

 

1. Preheat oven to 350°. Coat a 10-in. fluted tube pan with cooking spray; dust lightly with flour, tapping out excess.
2. Mix first five ingredients with a fork until crumbly. Sprinkle onto bottom of prepared pan.
3. For batter, mix oats, flours, cinnamon, baking powder, baking soda, salt and nutmeg. In another bowl, beat butter and brown sugar until crumbly; beat in vanilla and eggs, one at a time. Add oat mixture alternately with sour cream, beating well (batter will be thick). Fold in zucchini. Pour over crumb mixture.
4. Bake until a toothpick inserted in center comes out clean, 35-40 minutes. Cool 10 minutes before removing to a wire rack. Serve warm or at room temperature; dust with confectioners’ sugar before serving.

Recipe Notes

Zucchini: I shred it without peeling and squeeze out excess moisture if previously frozen.
Butter: I always soften mine, never melt it, for the crumb and batter.
Sour cream: I use reduced-fat or full-fat interchangeably.
Cooling: I let the cake cool exactly 10 minutes before removing from the pan.
Storage: I dust confectioners’ sugar only on slices being served immediately.