Cinnamon Donut Loaf

My kitchen smelled like a bakery on a rainy Sunday morning when I first pulled this cinnamon donut loaf from the oven, and my roommate actually gasped at the golden crust. The cinnamon sugar coating crackled softly as I brushed it on, and I knew right then this recipe was going on permanent rotation. It captures everything you love about a warm cinnamon donut but in a lazy, sliceable form that requires no frying or yeast.

I brought a loaf of this to a brunch potluck last fall, and three people asked for the recipe before I even set down my coat. One friend texted me the next day saying she had already made it twice, which is honestly the highest compliment a recipe can get.

Ingredients

• All-purpose flour (2 cups): Provides the sturdy but tender structure, and scooping with a spoon before leveling keeps measurements accurate.
• Granulated sugar (3/4 cup for loaf): Adds just enough sweetness without overpowering the cinnamon, letting the spice shine through.
• Baking powder and baking soda (2 tsp and 1/2 tsp): This dual leavening combo gives the loaf a beautiful, even rise with a fluffy interior.
• Salt (1/2 tsp): Don't skip it, as salt amplifies the cinnamon and balances the sweetness in a way you will notice if it's missing.
• Ground cinnamon (1 tsp for loaf plus 1 tsp for topping): Use fresh cinnamon if possible because it loses potency quickly and the flavor here is the star.
• Large eggs (2): They bind everything together and contribute to that rich, cakey crumb texture.
• Whole milk (3/4 cup): The fat content matters, so avoid skim milk because it leaves the loaf tasting lean rather than lush.
• Unsalted butter, melted and cooled (1/2 cup for loaf): Melted butter creates a denser, more tender crumb than creamed butter, which is exactly what you want here.
• Pure vanilla extract (2 tsp): A generous amount rounds out the warmth of cinnamon and makes the flavor feel complete.
• Unsalted butter, melted (1/4 cup for topping): This acts as the glue for the cinnamon sugar, so paint it generously.
• Granulated sugar and cinnamon for topping (1/3 cup sugar plus 1 tsp cinnamon): This crunchy, sweet blanket is what transforms a simple loaf into something reminiscent of a donut shop.

Instructions

Preheat and prep the pan:

Set your oven to 350°F and grease a 9x5-inch loaf pan, then line it with parchment paper leaving overhang on the sides for easy removal later.

Mix the dry ingredients:

In a large bowl, whisk together the flour, sugar, baking powder, baking soda, salt, and cinnamon until evenly distributed and no clumps remain.

Combine the wet ingredients:

In a separate bowl, whisk the eggs, milk, melted butter, and vanilla until smooth and uniformly blended.

Bring it all together:

Pour the wet mixture into the dry and fold gently with a spatula just until no dry streaks remain, stopping before the batter looks smooth or overworked.

Fill the pan and bake:

Scrape the batter into your prepared pan, smooth the top with a spatula, and bake for 40 to 45 minutes until a toothpick comes out clean from the center.

Cool briefly:

Let the loaf rest in the pan for 10 minutes, then use the parchment overhang to lift it out onto a wire rack.

Apply the butter wash:

While the loaf is still warm, brush melted butter generously over the top and sides so the cinnamon sugar has something to cling to.

Add the cinnamon sugar crust:

Mix the sugar and cinnamon in a small bowl, then sprinkle and gently pat it over every buttered surface until fully and evenly coated.

Let it set:

Allow the loaf to cool completely before slicing so the crumb has time to firm up and the topping sets into a delicate crust.

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The moment I patted that first layer of cinnamon sugar onto a still-warm loaf and heard the faint crunch under my fingers, this recipe stopped being just cake and became something I genuinely looked forward to sharing.

Twists Worth Trying

Fold half a cup of mini chocolate chips into the batter when you want a moody, indulgent version that pairs perfectly with a rainy afternoon and a big mug of something warm.

What to Serve It With

This loaf shines brightest alongside a strong cup of coffee or a spiced chai, and a cold glass of milk turns a simple slice into an afternoon ritual worth repeating.

Storage and Make Ahead Tips

The loaf stays wonderfully moist for up to three days wrapped tightly at room temperature, and it freezes beautifully for up to two months if you want to stash a backup loaf.

• Wrap slices individually in plastic wrap before freezing so you can thaw exactly what you need.
• Reheat a slice in the microwave for ten seconds to bring back that fresh baked softness.
• Keep the cinnamon sugar coating intact by storing the loaf cut side down on a plate or in an airtight container.

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Keep this recipe close because once someone you love tastes it, they will ask you to make it again and again. A warm slice of cinnamon donut loaf on a quiet morning is honestly one of the simplest joys a kitchen can offer.

Recipe Q&A Section

→ Can I use a different size loaf pan?

A 9x5-inch pan is ideal for this loaf. If using an 8x4-inch pan, the batter may overflow, so fill only three-quarters full and use any remaining batter for muffins. Adjust baking time accordingly—check with a toothpick five minutes earlier.

→ Why did my loaf turn out dense?

Overmixing the batter is the most common cause. Stir the wet and dry ingredients together only until just combined. A few lumps are perfectly fine. Also ensure your baking powder and baking soda are fresh and active.

→ Can I make this loaf ahead of time?

Yes, it stays moist for up to three days at room temperature when wrapped tightly in plastic wrap. You can also freeze the cooled loaf (without the topping) for up to two months. Add the butter and cinnamon-sugar coating after thawing and gently warming.

→ Can I substitute the whole milk with another liquid?

Buttermilk works beautifully and adds a pleasant tang—use the same amount. Plant-based milks like oat or almond milk can also be used, though the crumb may be slightly less rich. Avoid skim milk, as the fat contributes to the tender texture.

→ How do I get the cinnamon-sugar topping to stick well?

Apply the melted butter while the loaf is still warm but not hot. This allows the butter to absorb slightly into the surface, creating a sticky base for the cinnamon-sugar. Pat the sugar mixture on firmly with your hands rather than just sprinkling for the most even, generous coating.

→ Can I add mix-ins to the batter?

Absolutely. Fold in up to half a cup of mini chocolate chips, chopped walnuts, or even diced apples at the end. Add-ins like blueberries work too but may make the loaf slightly heavier—toss them in a tablespoon of flour first to prevent sinking.