Keto Chocolate Pumpkin Bundt Cake

I started making this marble cake because I wanted one fall dessert that could sit on the table and look like I'd spent half the day baking. Two separate batters layered in a bundt pan, baked once, frosted, done. The pumpkin half is spongy and full of warm spice (cinnamon, nutmeg, allspice from the pumpkin pie spice blend). The chocolate half is dense, almost brownie-like in the center. When you slice through, you get those defined swirls that make it look way more complicated than it is.

The trick that took me a few batches to figure out: layering order controls everything. Half the pumpkin batter goes in first, then all the chocolate, then the remaining pumpkin on top. I tried the classic marble method of alternating thin scoops, and the result was a uniform brown with no visible swirl. The half-all-half method locks in clean ribbons of each flavor. If you weigh your bowl before and after mixing the shared wet base, you can divide by two and get perfectly even layers. Not required, but it helps if you're particular like I am.

The cream cheese frosting on top gets thinned with a splash of nut milk until it drips down the ridges. If you've made my keto spice cake, the frosting technique is similar, though here I keep it slightly thicker so it clings to the curves. Crushed pecans pressed into the frosting while it's still wet add crunch and make the whole thing look like it came from a bakery.

This is what I bring to Thanksgiving, Halloween parties, any fall gathering where regular desserts will be everywhere. Nobody identifies it as keto. I've watched people go back for seconds before even asking about ingredients, which tells me the texture and sweetness are dialed in. If you're building a pumpkin dessert spread, a keto pumpkin cheesecake or a batch of pumpkin cupcakes round things out without repeating the same flavor.

For the chocolate lovers at your table, reader Danielle added Lily's dark chocolate chips to the chocolate layer and said they melted into 'little pockets all through the cake.' I'm trying that next batch. And if you want a simpler single-layer chocolate option, my chocolate cake is a low-carb version that comes together in about half the time.

Boosting the chocolate layer

I partnered with Earth Echo on this recipe and used their Cacao Bliss in the chocolate layer. It’s a raw cacao powder blended with turmeric, cinnamon, black pepper, lucuma, and Himalayan salt. The spice blend adds a warmth to the chocolate that straight cocoa powder doesn’t have on its own. I use it as a partial substitute for cocoa powder in a lot of my chocolate baking now, and I like that I’m getting superfoods worked in without thinking about it.

Get 15% off Cacao Bliss with my code KETOFOCUS.

Toppings and mix-ins I've tested

I top mine with cream cheese frosting and crushed pecans because the pairing just works with pumpkin spice, but I’ve experimented with other options. Here’s what I’ve tried.

Mix-ins for the batter

• Chocolate chips: Reader Danielle added Lily’s dark chocolate chips to the chocolate layer and they melted into little pockets throughout. About 1 cup, folded into the chocolate batter before layering. I’m doing this every time now.
• Chopped nuts: Pecans or walnuts folded into the pumpkin layer add crunch. I prefer pecans for the flavor match with pumpkin spice.

Topping swaps

• Powdered sweetener dust: Skip the frosting entirely and just dust the top. Simple, elegant, fewer carbs per slice.
• Sugar free glaze: Drop the cream cheese, add 2 extra tablespoons of butter, and thin with heavy cream or nut milk for a pourable glaze.
• Chocolate ganache: Melt sugar free chocolate with a teaspoon of coconut oil and drizzle over the top. I use this same technique on my Halloween ghost bundts and it works every time.
• Coconut flakes: Unsweetened coconut chips pressed into wet frosting add texture and a hint of tropical flavor.

If you love the bundt pan format, my berry version uses a completely different flavor profile but the same pan prep technique.

Oat fiber in keto baking

Oat fiber is what makes this work as a keto recipe. It’s made from the outer hull of the oat grain, not the starchy inner part, so it’s essentially zero net carbs. In this recipe, it does two jobs: it gives the crumb a soft, tender structure that almond flour alone can’t produce, and it acts as the pan-release agent when you dust it over the buttered pan.

I started using oat fiber after too many batches came out crumbly with just almond flour. The difference in texture was obvious from the first test. The cake held together, sliced cleanly, and had that spongy quality you expect from a traditional cake. If you can’t find oat fiber locally, it’s widely available online. I keep a bag in my pantry at all times because I use it in so many of my baking recipes.

How to store and freeze this cake

Store the cake in the refrigerator, covered with plastic wrap or in an airtight container. It keeps well for up to 5 days. If you’re making it ahead for a gathering, I bake it 1-2 days before and store it unfrosted. The cream cheese frosting can be made ahead and kept in a separate container in the fridge for up to a week.

Before serving, let the frosting sit at room temperature for about 30 minutes so it’s pourable, then drizzle it over the cake.

This freezes well for up to 2 months. Wrap the unfrosted cake tightly in plastic wrap, then slide it into a freezer-safe bag or wrap in aluminum foil. Thaw in the fridge overnight before frosting. I’ve frozen and thawed this cake twice and the texture held up both times, though the pumpkin layer gets slightly more dense after freezing. Still good, just a touch different.