Cinnamon Donut Loaf

The smell of cinnamon toast on Saturday mornings shaped my entire childhood, so when I discovered I could bake that same warm, sticky comfort into a loaf cake, I practically lunged for the mixing bowl. This cinnamon donut loaf is essentially that feeling made sliceable, with a gooey brown sugar swirl running through the middle and a buttery cinnamon crust on top. It takes all of fifteen minutes to throw together. The hardest part is waiting for it to cool before cutting in.

I brought this to a friend's brunch once and watched three people ignore an entire spread of bagels and fruit just to get seconds of the loaf. One friend stood at the counter eating it over the parchment paper, which honestly is the highest compliment any baker can receive.

Ingredients

• All purpose flour (1 and a half cups, 190g): Spoon and level it rather than scooping straight from the bag to avoid a dense, heavy crumb.
• Granulated sugar (three quarters cup, 150g): Regular white sugar keeps the batter tender and lets the cinnamon take center stage.
• Baking powder (2 tsp): Check that it is still active by dropping a pinch into hot water; it should bubble immediately.
• Salt (half tsp): Just enough to sharpen the sweet spices without making itself noticed.
• Ground cinnamon (1 tsp in batter): Use a fresher jar if yours has been sitting in the cupboard for over a year, because cinnamon loses its punch fast.
• Milk (half cup, 120ml): Whole milk gives the richest texture, but any milk you have on hand works fine.
• Large eggs (2): Bring them to room temperature so they incorporate smoothly into the batter without causing the melted butter to seize.
• Unsalted butter, melted (one third cup, 75g): Let it cool slightly after melting so it does not cook the eggs on contact.
• Vanilla extract (1 tsp): A quiet background note that rounds out the cinnamon beautifully.
• Brown sugar (one third cup, 70g) for the swirl: Light or dark both work, though dark brings a deeper molasses warmth.
• Ground cinnamon (1 tsp) for the swirl: Mixed with the brown sugar to create that irresistible ribbon through the center.
• Unsalted butter, melted (2 tbsp) for topping: Brushed on while the loaf is warm so the cinnamon sugar adheres and forms a delicate crust.
• Granulated sugar (quarter cup, 50g) for topping: Combines with cinnamon for that classic donut shop finish.
• Ground cinnamon (1 tsp) for topping: The final flourish that makes your kitchen smell like a bakery.

Instructions

Prep the oven and pan:

Heat your oven to 350 degrees Fahrenheit and grease an 8 by 4 inch loaf pan before lining it with parchment, leaving the edges hanging over like handles for easy removal later.

Whisk the dry team:

In a large bowl, combine the flour, granulated sugar, baking powder, salt, and cinnamon, whisking until evenly distributed and free of lumps.

Blend the wet ingredients:

In a separate bowl, beat the milk, eggs, melted butter, and vanilla together until the mixture looks smooth and slightly frothy on the surface.

Bring it all together:

Pour the wet mixture into the dry ingredients and fold gently with a spatula just until you no longer see dry flour streaks, because overmixing is the enemy of a tender crumb.

Make the cinnamon sugar swirl:

Stir the brown sugar and cinnamon together in a small bowl, then resist the urge to eat it by the spoonful.

Layer and assemble:

Pour half the batter into your prepared pan, sprinkle the cinnamon sugar mixture evenly across the surface, then cover with the remaining batter and smooth the top gently.

Bake until golden:

Slide the pan into the center rack and bake for 40 to 50 minutes, checking at the 40 minute mark with a toothpick that should come out clean from the middle.

Cool and crown with topping:

Let the loaf rest in the pan for 10 minutes, then transfer it to a wire rack and immediately brush the warm top with melted butter before showering it with the cinnamon sugar topping.

Wait patiently:

Allow the loaf to cool completely before slicing so the crumb has time to set and the swirl does not tear apart into a messy crumble.

Pin it

One rainy Tuesday I wrapped a still slightly warm slice in a napkin and tucked it into my bag for later, and finding it that afternoon felt like a small gift I had forgotten I gave myself.

Storing and Keeping It Fresh

Wrapped tightly in plastic or stored in an airtight container at room temperature, this loaf stays wonderfully moist for up to three days. Beyond that, the edges begin to dry out while the center still tastes lovely, so I usually slice and freeze whatever I know I will not finish within that window.

Fun Variations to Try

Swap the cinnamon for pumpkin spice in autumn and the entire character of the loaf shifts toward something richer and more fragrant. You can also fold a handful of chopped toasted pecans into the batter for crunch, or drizzle a simple glaze of powdered sugar and milk over the cooled top if you want to push it firmly into dessert territory.

Tools That Make This Easier

A sturdy whisk and a good silicone spatula are really all you need beyond the basics, though a parchment lined loaf pan is nonnegotiable for a clean release.

• If your loaf pan is dark metal, reduce the oven temperature by 25 degrees to prevent the edges from browning too quickly.
• An offset spatula helps spread the batter into even layers when you are building that swirl.
• Always set a timer five minutes before the earliest bake time so you never accidentally overcook it.

Pin it

Some recipes you make once and forget, but this one has a way of becoming a quiet staple that people start requesting without even realizing it. Keep it in your back pocket and watch it disappear.

Recipe FAQs

→ Can I use a different size loaf pan?

An 8x4-inch pan works best for this loaf. If using a 9x5-inch pan, reduce baking time by about 5–8 minutes and check for doneness early. A smaller pan may overflow, so keep an eye on it.

→ How should I store leftover cinnamon donut loaf?

Wrap the cooled loaf tightly in plastic wrap or store in an airtight container at room temperature for up to 3 days. You can also freeze individual slices for up to 2 months.

→ Can I substitute pumpkin spice for the cinnamon?

Yes, swapping ground cinnamon for pumpkin spice adds a warm seasonal twist with notes of nutmeg, ginger, and cloves. Use the same amount called for in the batter and topping.

→ Why did my loaf sink in the middle?

A sunken center usually means the loaf was underbaked or the oven temperature fluctuated. Always test with a toothpick—it should come out clean from the center before removing from the oven.

→ Can I make this loaf dairy-free?

You can replace the milk with a plant-based alternative like oat or almond milk, and swap the butter for a vegan butter or neutral oil. The texture will be slightly different but still delicious.