Recipes | Cakes & Cupcakes

Low FODMAP Blackout Cake


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If you are looking for a very chocolaty experience in cake form, that happens to be easy to make, this Low FODMAP Blackout Cake is the perfect choice. Make this cake for Father’s Day, Mother’s Day, Birthdays – or anytime you want a knockout chocolate cake. No one will even imagine that this is gluten-free and lactose-free and LOFO! You don’t even have to mention it.

horizontal image of Low FODMAP Blackout Cake on white plate
The filling and frosting is made from an easy-to-make stovetop pudding!

This Blackout Cake Is Historic

The visual of this cake, with its shaggy coating of dark cake crumbs, harkens back to Ebinger’s Blackout Cake, beloved in the New York area. The bakery closed its doors in the early 1970s and the original recipe was never published; my version uses “black” cocoa, which is a specialty product that you can order online. (I have never seen it in stores, except for the King Arthur Flour store in VT).

whole low FODMAP Blackout Cake on white pedestal

Black cocoa has the color and flavor of the cocoa in Oreo cookies, and when combined with natural cocoa in this recipe, it gives the cake an extra-deep chocolaty boost. You could use 2/3 cup natural cocoa total if you like; the cake will not be as dark in color or rich in flavor, but it will work.

Now would be a great time to read our article, All About Cocoa.

vertical low FODMAP Blackout Cake wedge on white plate with silver fork
The “Frosting” Is Pudding!

The filling and frosting for our Low FODMAP Blackout Cake version is actually a rich pudding. The original cake used pudding as well as a component. Use the cocoas and chocolates suggested below in the ingredients for best results (like the black cocoa). The pudding component is best made a day ahead so that it can chill and become firm enough to fill and frost the cake.

By the way, this impressive-looking Blackout Cake is very easy to make and I consider it to be one of my most reliable party cakes. Everyone loves a rich chocolate cake and it is so moist that it keeps well for a few days in the fridge. Don’t tell anyone how easy it is; people will think you slaved over it.

closeup of Blackout Cake

Let’s Talk Dairy

There is a fair amount of dairy in this Low FODMAP Blackout Cake. As you know, the low FODMAP diet is not a dairy-free diet, but it is lowered in lactose. Finding lactose-free whole milk is easy. Finding lactose-free heavy cream might not be.

Two points to consider: You can refer to our DIY Lactose-free Dairy article to make your own, or just adhere to our serving sizes and you will be OK.

Low FODMAP Blackout Cake on display cake cut open

Ingredients For Low FODMAP Blackout Cake Filling & Frosting

This recipe has two components: the cake and the filling/frosting. First up, the filling and frosting ingredients. It has to chill overnight, so make the pudding/frosting first!

Ingredients for Blackout Cake Filling and Frosting

It is easy to whip up, too.

Ingredients For Low FODMAP Blackout Cake

The ingredients for the cake are fairly standard, except for the black cocoa, which you might have to order ahead, so plan accordingly.

Ingredients for Blackout Cake

Low FODMAP Blackout Cake Assembly

Let’s walk through assembling the cooled cake layers and filling and frosting them with chilled, firm pudding.

Your pudding should be made the day before, to chill overnight in the fridge. Cake layers should be cooled and each one of them divided in half horizontally.

Then, crumble one of the layers with your fingertips and place in a below, as shown below. Set aside for later.

crumble one of of the cake layers for low FODMAP Blackout Cake

Then, use the chilled pudding to “frost” the layers. Glide your icing spatula over the pudding; don’t let it contact the cake or you will bring crumbs up into the frosting.

Apply chilled, firm chocolate pudding to layer of low FODMAP Blackout Cake. Use icing spatula, gliding it over the pudding and not touching the cake

Allow the pudding to ooze out of the sides as seen below. You will use this excess to “frost” the sides of the cake in the next step.

let the pudding ooze out between the layers

Then, coat the entire cake, top and sides, with pudding.

coat the entire cake with the chilled pudding

Time to grab the cake crumbs that you put aside. Cover the entire cake with crumbs from that first layer that you crumbled and reserved. Below you can see that there are still a few spots that need some cake crumbs attached. The luscious pudding is peeking through!

adding crumbs to exterior of low FODMAP Blackout Cake on cake turntable

You can see above that I used my cake decorating turntable to facilitate the process. If you have one, use it!

If you are looking for a super simple chocolate experience, be sure to check out our Low FODMAP Chocolate Pudding Cake!

Now, let’s make a Blackout Cake together!

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horizontal image of Low FODMAP Blackout Cake on white plate
4 from 12 votes

Low FODMAP Blackout Cake

If you are looking for a very chocolaty experience in cake form, that happens to be easy to make, this Low FODMAP Blackout Cake is the perfect choice. Moist cake with a rich pudding that you use for the filling and the frosting.

Makes: 20 Servings
Prep Time: 20 minutes
Cook Time: 35 minutes
Total Time: 55 minutes
Author: Dédé Wilson





  1. For the Pudding: Place the cornstarch in a medium-sized saucepan. In a large measuring cup, combine the milk and cream. Drizzle a few tablespoons of the milk-cream mixture over the cornstarch and whisk until smooth. Pour the remaining milk-cream into the pan, then add sugar, chocolate, and salt. Cook over medium-low heat, whisking often, until the chocolate melts, then watch carefully as you bring it to a gentle boil. Whisk often as it thickens and takes on a pudding-like consistency; it should gently simmer for about 2 to 3 minutes. The pudding should be thick and glossy and leave whisk marks on top.

  2. Remove from the heat and whisk in the vanilla. Scrape into an airtight container; cool to warm room temperature. Press plastic wrap directly onto the surface, snap on the lid, and refrigerate for at least 6 hours or preferably overnight.
  3. For the Cake: Position a rack in the middle of the oven. Preheat the oven to 350° F (180°C).

  4. Coat two 8-inch by 2-inch (20 cm by 5 cm) round cake pans with nonstick spray, line the bottoms with parchment rounds, and then spray the parchment.
  5. Whisk together the flour, sugar, both cocoas, espresso powder, baking soda, and salt in a large bowl to aerate and combine. Whisk together the water, oil, vinegar, and vanilla in a medium bowl. Pour the wet ingredients over the dry mixture and whisk well until combined and very smooth. Divide the batter evenly between the two pans. Firmly tap the bottom of the pans on the work surface to dislodge any bubbles.
  6. Bake for 30 to 35 minutes, or until a toothpick inserted in the center shows a few moist crumbs when removed. Cool cakes in the pans on racks for about 10 minutes. Unmold, peel off the parchment, and place directly on the racks to cool completely. Trim the layers to be level, if necessary, reserving the scraps. The layers are ready to use. Alternatively, place the layers on same size cardboard rounds and double wrap in plastic wrap; store at room temperature and assemble within 24 hours.
  7. For the Assembly: Have all the components ready to use. Slice both cake layers evenly in half horizontally. Three layers will be used to assemble the cake. The fourth should be crumbled by hand into a bowl along with any scraps; this will be used for the exterior of the cake. Place one cake layer on a serving plate, bottom side down. Cover with a thick layer of pudding, top with the second cake layer and another layer of pudding. Top with the third cake layer, bottom side up. Cover the top and sides generously with pudding, which will be thick enough to stick to the cake. Use your fingers and palms to completely cover the cake top and sides with cake crumbs, pressing them into the pudding to adhere. Refrigerate for at least 2 hours and up to 2 days before serving slightly chilled.



  • Most cakes dry out in the fridge; the blackout cake doesn’t since it is filled and frosted with the pudding, which makes it a great do-ahead dessert for a birthday party or other celebration.
  • This is one of those cakes that looks impressive but is actually very easy. It’s always good to have that kind of cake in your repertoire.

FODMAP Information

Our recipes are based on Monash University and FODMAP Friendly science.

  • Chocolate: Monash University has lab tested dark, milk and white chocolate all have low FODMAP amounts: 85% dark at 20 g; dark at 30 g; milk at 20 g; white at 25 g.
  • Oil: All pure oils are fats and contain no carbohydrates, therefore they contain no FODMAPs.
  • Sugar: Monash University and FODMAP Friendly have both lab tested white, granulated sugar. Monash states that a Green Light low FODMAP serving size of white sugar is ¼ cup (50 g). FODMAP Friendly simply states that they have tested 1 tablespoon and that it is low FODMAP. Regular granulated white sugar is sucrose, which is a disaccharide made up of equal parts glucose and fructose. Sucrose is broken down and absorbed efficiently in the small intestine.

Please always refer to the Monash University & FODMAP Friendly smartphone apps for the most up-to-date lab tested information. As always, your tolerance is what counts; please eat accordingly. The ultimate goal of the low FODMAP diet is to eat as broadly as possible, without triggering symptoms, for the healthiest microbiome.

Course: Dessert
Cuisine: American


Calories: 398kcal | Carbohydrates: 64g | Protein: 4g | Fat: 15g | Saturated Fat: 3g | Sodium: 257mg | Potassium: 79mg | Fiber: 2g | Sugar: 40g | Calcium: 9mg | Iron: 2mg

All nutritional information is based on third-party calculations and should be considered estimates. Actual nutritional content will vary with brands used, measuring methods, portion sizes and more. For a more detailed explanation, please read our article Understanding The Nutrition Panel Within Our Recipes.