Cinnamon Donut Loaf

The smell of cinnamon toast on Saturday mornings is wired into my brain, so when I stumbled across the idea of baking a loaf that tastes exactly like a cinnamon donut, I dropped everything and headed for the kitchen.

My neighbor knocked on my door the afternoon I tested this, asking if I had been baking at a bakery.

Ingredients

• All purpose flour (1 1/2 cups / 190g): The backbone of the loaf and spooning into the cup rather than scooping keeps it tender.
• Granulated sugar (3/4 cup / 150g): Just enough sweetness without turning this into a cupcake.
• Baking powder (2 tsp): Gives the loaf its gentle rise and anything fresher than six months old works best.
• Salt (1/2 tsp): Balances the cinnamon and sugar beautifully.
• Ground cinnamon (1 tsp for batter plus 1 tsp for swirl plus 1 tsp for topping): Use a fresh jar if you can because stale cinnamon tastes like dusty cardboard.
• Milk (1/2 cup / 120ml): Whole milk makes a richer crumb but any milk you have on hand works.
• Large eggs (2): They bind everything together and should be at room temperature so the batter mixes smoothly.
• Unsalted butter melted (1/3 cup / 75g for batter plus 2 tbsp for topping): Melted butter is what makes this taste like a donut rather than a plain cake.
• Vanilla extract (1 tsp): A quiet background note that rounds out the cinnamon.
• Brown sugar (1/3 cup / 70g): Used in the swirl layer and its molasses depth is what makes that middle section irresistible.
• Granulated sugar for topping (1/4 cup / 50g): Mixed with cinnamon and brushed onto the warm loaf for that classic donut crust.

Instructions

Preheat and prep the pan:

Set your oven to 350 degrees F (175 degrees C) and line an 8x4 inch loaf pan with parchment paper, leaving some overhang for easy removal later.

Mix the dry ingredients:

Whisk the flour, granulated sugar, baking powder, salt, and cinnamon in a large bowl until evenly combined and you see no clumps.

Combine the wet ingredients:

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

Bring the batter together:

Pour the wet into the dry and fold gently with a spatula just until you no longer see dry flour streaks.

Make the cinnamon sugar swirl:

Stir the brown sugar and cinnamon together in a small bowl and resist the urge to snack on it straight from the spoon.

Layer and assemble:

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

Bake until golden:

Slide it into the oven for 40 to 50 minutes and check with a toothpick at the 40 minute mark because every oven has its own personality.

Cool and finish with the donut topping:

Let the loaf rest in the pan for 10 minutes, then transfer to a wire rack and while it is still warm brush the top with melted butter and shower on the cinnamon sugar topping.

Save

I wrapped a slice in a napkin and tucked it into my bag for a road trip once and it tasted even better eaten cold at a highway rest stop.

Storing This Loaf

Wrapped tightly in plastic or stored in an airtight container, this loaf stays moist and flavorful for up to three days at room temperature.

Serving Ideas

A warm slice with a scoop of vanilla ice cream melting over the top turns this breakfast loaf into a genuinely memorable dessert.

Seasonal Twists and Final Thoughts

In autumn I swap the cinnamon for pumpkin spice and the loaf suddenly tastes like Thanksgiving morning in a pan.

• Toast leftover slices in a skillet with a little butter for a crispy edged treat.
• A light dusting of powdered sugar over the cinnamon topping adds a pretty finish for guests.
• Always let the loaf cool completely before slicing or the crumb will tear and the swirl will smudge.

Save

This loaf is the kind of recipe that earns a permanent spot in your handwritten collection because it asks for almost nothing and gives back so much warmth.

Common Questions

→ 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 to 10 minutes and check doneness early with a toothpick. The loaf will be slightly shorter but still delicious.

→ Why did my cinnamon sugar layer sink to the bottom?

This can happen if the batter is too thin. Make sure to measure flour accurately by spooning into the cup and leveling off. Also, pour half the batter, add the cinnamon layer, then gently spread the remaining batter on top without pressing down.

→ How should I store leftover slices?

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

→ Can I make this loaf ahead of time?

Yes, this loaf actually tastes even better the next day as the cinnamon flavor deepens. Bake it a day ahead, let it cool completely, and wrap it tightly overnight. Add the butter and cinnamon sugar topping just before serving for the freshest texture.

→ What can I substitute for the milk?

Buttermilk works wonderfully and adds extra tenderness. You can also use plain yogurt thinned with a little water, or a plant-based milk like oat or almond milk for a dairy-free option while keeping in mind the butter would also need swapping.