Donut Loaves
Banana Old-Fashioned Donut Loaf
A deeply moist banana old-fashioned donut loaf layered with buttery streusel and finished with a vanilla crackle glaze.
Prep
25 min
Bake
About 50 min, or longer as needed
Total
2 hr 30 min
Yield
One 9x5-inch loaf
A note from my kitchen
Before you bake this
This is the banana loaf I cannot stop picking at: deeply moist, warm with brown sugar and nutmeg, covered in buttery crumble, and finished with a thin vanilla glaze and coarse sanding sugar.
Use incredibly ripe bananas, keep the streusel cold, and mix only until the thick batter comes together. Bake it at 350°F, tent the top after 45 minutes, and use both the center temperature and tester cues before taking it out of the oven.
Save me a slice ;)
Thinking out loud
The Loaf I Cannot Stop Picking At
The cravings, questions, and running commentary behind this bake.
Sometimes I avoid making banana bread simply because I cannot stop picking at it. There is something about the way banana adds moisture and warmth to a cake that no other ingredient can quite replicate. Even when the ingredient list is simple, the finished loaf still tastes incredibly decadent.
So a Banana Old-Fashioned Donut Loaf was an immediate yes. Some of my banana desserts are already among the recipes you love most, and I wanted to bring those same qualities into the donut-loaf series: a soft, deeply moist banana crumb, buttery streusel through the middle and over the top, and a thin glaze that settles into every little ridge.
I finish it with coarse sanding sugar because that tiny bit of crunch makes such a difference against the tender cake and buttery topping. Nothing about this loaf needed to be complicated. It was a simple, easy, completely natural addition to the series - and exactly the kind of banana loaf I have to keep myself from picking at every time I walk past it.
Read this first
The quick notes.
Flavor
Ripe banana, brown sugar, vanilla, nutmeg, and a donut-style glaze.
Texture
Moist banana loaf, two layers of buttery streusel, and a thin crackly glaze.
Best moment
The soft center crease where the glaze and buttery crumble settle together.
From this recipe
Tested notes
For the most donut-like finish, keep the glaze thick enough to coat the loaf instead of soaking in.
If using an instant-read thermometer, look for 205-210°F in the center.
I test all of my recipes using non-dairy ingredients, but you can substitute with the ingredients you have on hand.
If you're curious, I test with Forager Unsweetened Plain Yogurt, Silk Unsweetened Original Soymilk, and Country Crock Plant Butter Sticks.
Ingredient notes
Key ingredients
Very ripe bananas
Use bananas that are deeply spotted and soft. They bring sweetness, moisture, and the cozy banana flavor that makes this loaf worth making before the glaze even goes on.
Ground nutmeg
Nutmeg is the quiet donut-shop flavor here. You do not need much; just enough makes the banana loaf taste warmer and more like an old-fashioned donut.
All-purpose flour + cornstarch
All-purpose flour gives this high-moisture loaf enough structure, while cornstarch keeps the finished crumb soft and tender.
Plain unsweetened yogurt
Yogurt adds body and tenderness without making the batter too loose. It also works with the baking soda and vinegar to help the loaf rise.
Vanilla crackle glaze
A thick but pourable glaze is what gives this loaf its donut finish. Keep it fluid enough to run down the sides, but not so thin that it disappears into the cake.
Coarse sanding sugar
Modern Mountain Baking Company White Sparkling Sugar is my go-to sanding sugar. I get it on Amazon, and it adds a crisp, sparkly finish without melting into the top.
Optional ingredient notes
Use what you have on hand
Curious what I used? These are the exact products I reached for while developing this recipe.
Yogurt
Plain unsweetened yogurt
Plain unsweetened yogurt adds moisture, acidity, and body so the crumb bakes up tender without tasting tangy.
- Forager Unsweetened Plain Yogurt
Milk
Milk
Milk affects how smoothly a batter, filling, or frosting comes together. Soy milk and Ripple tend to emulsify well because their protein and fat help create a creamy, cohesive finish.
- Silk Original Unsweet
Butter sticks
Butter sticks
Use butter sticks for buttercream and fillings that need to hold their shape.
- Country Crock Plant Butter Sticks
Testing notes
Why this works
Why the nutmeg matters
Nutmeg is one of the flavors our brains connect with old-fashioned donuts. In this loaf it should not taste spicy; it should make the banana and vanilla feel more bakery-style.
Why the batter should be thick
The finished batter should be thick and scoopable rather than loose or pourable. Spread it gently so the middle streusel layer stays in place.
Why the streusel stays textured
A mix of fine crumbs and large buttery clusters creates contrast throughout the loaf. Keep the streusel loose as you layer half through the middle and scatter the rest over the top.
Why the glaze goes on a fully cooled loaf
A warm loaf will melt the glaze and make it soak in. A cooled loaf lets the glaze sit on the surface and set into that thin, crackly shell.
Why the loaf rests before slicing
Banana loaves are extra soft when they first come out of the oven. The pan rest and full cool give the crumb time to settle so each slice holds together.
Use both doneness cues
The center should reach 205-210°F, and a tester inserted into the cake portion should come out with moist crumbs rather than wet batter. Tent the loaf after 45 minutes, then give the center as much additional time as it needs.
How it comes together
From Instagram
Watch the reel
Watch the banana loaf bake up with crumb topping before the crackly glaze goes on.
Open the reelSmall things that matter
Tips for the best loaf
Use deeply overripe bananas that are soft and covered in brown or nearly black spots. Firm yellow bananas will not provide the same sweetness, moisture, or developed banana flavor.
For faster natural ripening, place the bananas in a loosely closed paper bag with an apple or another ripe banana and leave them at room temperature for 1-2 days.
If you need soft bananas immediately, place the unpeeled bananas on a parchment-lined baking sheet and bake at 300°F for 15-30 minutes, until the skins are black and the fruit is very soft. Cool completely before peeling and measuring. This softens and sweetens them, although naturally ripened bananas give the fullest flavor.
Mash the bananas until smooth so the banana flavor runs evenly through the loaf.
Whisk the wet ingredients until smooth and emulsified before adding the dry ingredients.
Stop mixing as soon as the flour disappears. Overmixing can make the loaf dense.
Keep the streusel loose and textured, with a mix of fine crumbs and large buttery clusters. Layer half through the middle of the batter and scatter the rest over the top.
The batter should be thick and scoopable rather than loose or pourable.
Tent the loaf loosely with foil at 45 minutes, then continue baking until the center reaches 205-210°F and a tester shows moist crumbs rather than wet batter.
Add the glaze slowly. It should ribbon off the whisk, not pour like milk.
Before you slice
Texture and serving notes
Let the glaze set for about 30 minutes before slicing if you want the cleanest pieces.
This loaf is dreamy while it is still warm, especially with a little softened or melted butter over a slice.
It tastes even better the next day after the banana, brown sugar, butter, and glaze have had time to settle and deepen.
This loaf is more fragile than my other donut loaves because of its extra moisture, so lift and slice it gently.
If it has been chilled, let slices sit at room temperature before serving so the crumb softens again.
Keep it good
Storage
Fridge
Store covered in the refrigerator for up to 4 days.
Fridge
The flavors come together beautifully after chilling overnight, and the loaf gets even better the next day.
Freezer
Freeze individual slices for up to 2 months. Thaw overnight in the refrigerator or at room temperature before serving.
Recipe FAQ
Questions that come up
How ripe should the bananas be?
Use very ripe bananas that are deeply spotted and soft, then mash them until smooth before measuring 220 g.
What should the batter look like?
The batter should be thick and scoopable rather than loose or pourable. Whisk only until the dry ingredients disappear.
How do I know when the loaf is done?
The center should reach 205-210°F, and a tester inserted into the cake portion should come out with moist crumbs rather than wet batter. Tent the loaf after 45 minutes and continue baking as long as the center needs.
Can I make this recipe gluten-free?
I have not tested this recipe with gluten-free flour, so I cannot guarantee the same texture, rise, or structure. If you would like to experiment, a cup-for-cup (1:1) gluten-free baking blend intended to replace all-purpose flour is the best place to start. Results may differ from the recipe as written.
Can I use Greek yogurt in this donut loaf?
I do not recommend it. Greek yogurt is much thicker and contains less moisture than the plain unsweetened yogurt used here, which can make the batter too thick and the finished loaf denser or drier. Use regular plain unsweetened yogurt for the texture this recipe was designed to have.
Can I substitute sour cream for the yogurt?
Yes, regular full-fat sour cream is the closest substitute. Replace the plain unsweetened yogurt with the same amount by weight. Sour cream is thicker and higher in fat, so the batter may be slightly thicker and the finished loaf a little richer and denser than the version I tested with yogurt. Avoid reduced-fat or fat-free sour cream, which can behave differently.
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