Dulce de Leche Crumb Cake

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There’s something about a crumb cake that feels low-effort and high-reward. No frosting, no layering, just one pan of something genuinely good.

This one has a ribbon of dulce de leche running through the center. It melts into the batter during baking and sets into a soft, caramel-scented stripe you hit with every slice.

The crumb on top is thick and sandy, not the thin dusty kind. Brown sugar, cold butter, cinnamon. It holds its shape and gives a real crunch against the tender cake underneath.

I make this on weekend mornings when I want something that feels a little special without a lot of fuss.

Why You’ll Love This Recipe

• Caramel center forms naturally as the cake bakes
• Thick, crunchy crumb topping that stays crisp for days
• Sour cream batter keeps every slice moist and tender
• One pan, no frosting, easy to slice and transport

Ingredient Notes

• dulce de leche: Store-bought works well here – La Lechera or Nestle are consistent brands. You can also use thick caramel sauce, but dulce de leche has a denser, milkier flavor that sets better in the batter.
• sour cream: Full-fat sour cream keeps the crumb moist and adds a slight tang that balances the sweetness. Plain whole-milk yogurt works as a 1:1 swap.
• all-purpose flour: Standard all-purpose flour is what you need for both the cake and the crumb. Bread flour makes the crumb too chewy and cake flour makes it too fine.
• cold unsalted butter (for crumb): The butter must be cold and cut into small cubes before rubbing into the crumb mixture. Softened butter turns the crumb into a paste instead of coarse sandy clumps.
• brown sugar: Dark brown sugar gives the crumb topping a deeper molasses flavor. Light brown sugar works fine but produces a slightly milder result.
• ground cinnamon: A teaspoon in the crumb is the right amount to complement the caramel without taking over. Vietnamese cinnamon has a stronger punch if you like more warmth.

Dulce de Leche Crumb Cake

A sour cream cake with a dulce de leche center and a thick brown sugar crumb topping, baked in one pan.

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Prep Time 20 minutes mins

Cook Time 45 minutes mins

Total Time 1 hour hr 25 minutes mins

Servings: 12 slices

Calories: 390

Ingredients Method Notes

Ingredients

  

Crumb Topping

• 180 g all-purpose flour spooned and leveled
• 110 g dark brown sugar packed
• 1 tsp ground cinnamon
• 1/4 tsp fine salt
• 110 g cold unsalted butter cut into 1 cm cubes

Cake Batter

• 280 g all-purpose flour spooned and leveled
• 1 1/2 tsp baking powder
• 1/2 tsp baking soda
• 1/2 tsp fine salt
• 115 g unsalted butter softened to room temperature
• 150 g granulated white sugar
• 2 large eggs room temperature
• 1 1/2 tsp vanilla extract
• 240 g full-fat sour cream room temperature

Filling

• 300 g dulce de leche store-bought or homemade, thick consistency

Method

 

Make the Crumb Topping

1. Combine flour, dark brown sugar, cinnamon, and salt in a medium bowl and stir together with a fork.
2. Add cold cubed butter and work it into the flour mixture with your fingertips or a pastry cutter until the mixture looks like coarse, clumpy sand with pea-sized pieces throughout.
3. Place the bowl in the freezer while you prepare the batter.

Prepare the Cake Batter

1. Heat the oven to 175 C / 350 F. Line a 9x13 inch baking pan with parchment paper, leaving overhang on the two long sides.
2. Whisk flour, baking powder, baking soda, and salt together in a bowl and set aside.
3. Beat softened butter and granulated sugar in a large bowl with a hand mixer on medium speed for 3 minutes, until pale and slightly fluffy.
4. Add the eggs one at a time, beating well after each addition, then mix in the vanilla extract.
5. Add the flour mixture in three additions, alternating with the sour cream in two additions, beginning and ending with flour. Mix on low speed just until no dry streaks remain - do not overmix.

Assemble and Bake

1. Spread the batter evenly into the prepared pan using an offset spatula.
2. Drop spoonfuls of dulce de leche across the entire surface of the batter, spacing them about 3 cm apart so every slice gets coverage.
3. Using the offset spatula or a knife, gently swirl or spread the dulce de leche slightly without fully mixing it into the batter.
4. Remove the crumb topping from the freezer and scatter it evenly over the dulce de leche layer, covering the surface completely with generous clumps.
5. Bake on the middle rack for 42 to 47 minutes, until the crumb is deep golden and a toothpick inserted near the edge of the pan comes out clean. The center may look slightly soft but will set as it cools.
6. Cool in the pan on a wire rack for at least 20 minutes before lifting out and slicing.

Notes

If your dulce de leche is very stiff, warm it in a small bowl for 15 seconds in the microwave so it spreads without tearing the batter.

Tips for Success

• Spoon dulce de leche in small dollops across the entire surface before adding the crumb so every slice gets caramel.
• Freeze the crumb mixture for 10 minutes before topping the cake to keep clumps intact during baking.
• Use a toothpick to test doneness at the edge of the pan, not the center, since the dulce de leche layer stays soft longer.
• Let the cake cool in the pan for at least 20 minutes before cutting so the caramel layer firms up and slices cleanly.
• Line the pan with parchment with overhang on both sides so you can lift the whole cake out without breaking the crumb.

Variations

• Swirl in 2 tbsp cream cheese with the dulce de leche layer for a tangy cheesecake-style ribbon.
• Add 60 g toasted pecans to the crumb topping for a nutty texture contrast against the soft cake.
• Replace half the dulce de leche with banana slices for a banana caramel crumb cake version.

Storage and Reheating

Store the cooled cake covered at room temperature for up to 2 days. The crumb stays crisp the first day and softens slightly by day two – still good, just less crunchy on top.

For longer storage, wrap individual slices in plastic wrap and refrigerate for up to 5 days. The dulce de leche center gets a little firmer when cold, so pull slices out 20 minutes before eating.

This cake freezes well. Wrap slices tightly and freeze for up to 2 months. Thaw at room temperature for about an hour. Reheat briefly in a 160 C / 320 F oven for 8 minutes to revive the crumb.

Serving Suggestions

A plain slice with a strong black coffee is the classic move. The bitterness of the coffee cuts through the caramel and makes the whole thing feel more balanced.

For a slightly dressed-up version, dust the top with a little powdered sugar right before serving and add a small spoonful of extra dulce de leche on the side for dipping.

This cake also works as a brunch centerpiece. Set it on a board with fresh berries and a small pot of whipped cream and it looks like you put in far more effort than you did.

FAQ

Why did my dulce de leche sink to the bottom of the crumb cake instead of staying in the middle?

This usually happens when the bottom layer of batter is too thin or too loose to support the dulce de leche weight. Spread the batter evenly and make sure it covers the pan fully before adding the caramel dollops.

Can I use cajeta instead of dulce de leche in this crumb cake?

Yes, cajeta works as a direct substitute. It’s made with goat’s milk so the flavor is slightly tangier and more complex, but the texture and baking behavior are the same.

How do I know when the crumb topping on this cake is properly baked and not just golden from browning too fast?

The crumb should look deep golden and feel set when you tap it lightly, not wet or greasy. If the top is browning before the cake is done, loosely tent with foil and continue baking.

Can I freeze dulce de leche crumb cake with the crumb topping still on?

Yes, freeze it with the crumb intact. Wrap slices tightly in plastic wrap then foil to prevent the crumb from absorbing moisture. The crumb softens slightly after freezing but firms back up when reheated in the oven.

Is dulce de leche crumb cake very sweet? Can I reduce the sugar in the cake base?

It is on the sweet side because of the caramel layer. You can reduce the sugar in the cake batter by 20 to 25 g without affecting the texture, and using dark brown sugar in the crumb instead of extra white sugar also helps balance the sweetness.

What’s the difference between a dulce de leche crumb cake and a coffee cake?

Coffee cake is a broad American category for any single-layer cake with a streusel topping, usually served at breakfast. This dulce de leche crumb cake is a coffee cake style but with a caramel filling layer that regular streusel coffee cakes don’t have.

Jesse

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