This easy low-carb raspberry coffee cake is a tender, buttery dessert made with almond flour, coconut flour, sour cream, fresh raspberries, and a simple almond streusel. It takes about 15 minutes to prepare and bakes at 350°F (175°C) for 35–45 minutes, making it a practical treat for breakfast, brunch, afternoon coffee, or dessert.
Every bite combines a soft, moist crumb with juicy berries and a lightly crisp cinnamon topping. Despite its name, coffee cake contains no coffee; it is traditionally served alongside coffee or tea, and this raspberry version is especially delicious with a hot mug of either.
Jump to RecipeWhy You’ll Love This Recipe
This cake delivers the comforting flavor of a classic coffee cake while using a low-carb flour blend and a 1:1 granulated sweetener. Almond flour brings a naturally rich, buttery taste, while a small amount of coconut flour helps absorb moisture and gives the crumb enough structure to hold the berries.
Sour cream is one of the key ingredients for a tender result. It adds richness and moisture without making the batter runny, and full-fat Greek yogurt can usually be used instead if that is what you have in the refrigerator.
The optional streusel is worth making because it adds a delicate crunch and a warm cinnamon note. For another small-batch sweet idea, you can also try these coffee cake muffins when you want individually portioned treats.
Ingredients You’ll Need
The cake batter uses straightforward ingredients that are easy to keep on hand. Choose blanched almond flour for a lighter color and softer texture, and avoid substituting almond meal unless you are comfortable with a more rustic crumb.
- Almond flour: The main flour and source of rich, tender texture.
- Coconut flour: A small amount absorbs liquid and supports the cake structure.
- Low-carb sweetener: Use granulated erythritol, monk-fruit sweetener, or another 1:1 option.
- Sour cream: Adds moisture, richness, and a soft bite.
- Raspberries: Fresh berries create bright bursts of tart flavor.
- Butter, eggs, and vanilla: These provide richness, binding, and classic cake flavor.
For the topping, almond flour, sweetener, cinnamon, and cold butter transform into crumbly streusel. If you prefer a simpler cake, the streusel may be omitted, but the raspberry topping will still look and taste lovely.
For a different sweet finish, our low-carb lemon meringue cookies offer a light citrus contrast to this richer berry cake.
How to Make It Step-by-Step
Step 1: Heat the oven to 350°F (175°C), then grease an 8-inch square baking pan or line it with parchment. Parchment makes the cooled cake easier to remove and helps protect the delicate edges.
Step 2: Prepare the optional streusel by combining the almond flour, granulated low-carb sweetener, and cinnamon. Rub in the cold butter until the mixture resembles coarse crumbs, then refrigerate it briefly if your kitchen is warm.
Step 3: Whisk the almond flour, coconut flour, baking powder, and fine salt in a medium bowl. Whisking distributes the baking powder and prevents concentrated salty or leavening pockets in the finished cake.
Step 4: In another bowl, whisk the melted and slightly cooled butter with the eggs, sour cream, sweetener, and vanilla. Continue until the mixture looks smooth and evenly blended, without needing to whip it.
Step 5: Add the dry ingredients to the wet ingredients and stir only until no obvious dry patches remain. Overmixing is unnecessary and can make a nut-flour cake dense, so stop as soon as the batter comes together.
Step 6: Pat the fresh raspberries dry with paper towels, then gently fold about three-quarters of them into the batter. Keeping the folding motion gentle helps prevent the berries from breaking apart and turning the entire batter pink.
Step 7: Spread the batter into the prepared pan and smooth the surface. Scatter the remaining raspberries on top, followed by the almond streusel, pressing neither the berries nor the crumbs deeply into the batter.
Step 8: Bake for 35–45 minutes, checking the center toward the end of the baking window. The cake is ready when the center is set and a toothpick inserted into the cake portion comes out mostly clean with a few moist crumbs.
Step 9: Let the cake cool in the pan for at least 20–30 minutes before cutting. Once cooled, use the parchment overhang or a thin spatula to lift it out, then slice it into 8–10 servings.
Chef’s Tips for the Best Texture
Measure almond flour by weight when possible. If using cups, spoon it lightly into the measuring cup and level it rather than scooping firmly, because packed almond flour can make the cake heavier and drier.
Fresh raspberries should be dry before they go into the batter. Excess surface moisture can make the center gummy, while frozen berries should be added directly from the freezer so they do not release a large amount of liquid before baking.
Do not judge doneness by the edges alone. Nut-flour cakes can brown before the middle is ready, so look for a set center and test the cake portion rather than poking directly into a juicy raspberry.
If the top begins to brown more quickly than the center cooks, loosely cover the pan with foil during the final portion of baking. Avoid sealing the foil tightly against the batter, since the topping needs room to remain crisp.
Easy Variations
A popular alternative uses only almond flour, usually about 2 cups, instead of the almond-flour and coconut-flour combination. The texture will be somewhat different, so the combined flour version is the most reliable choice when following this recipe as written.
For extra richness, make a cream-cheese filling with approximately 8 ounces cream cheese, 1/4 cup powdered low-carb sweetener, 1 egg, and 1/2 teaspoon vanilla. Spoon part of the batter into the pan, add the filling, cover with the remaining batter, and bake until the center is set.
For a berry variation, replace part of the raspberries with another berry while keeping the total fruit amount close to 1 cup. Softer or especially juicy fruit may release more moisture, so pat it dry and avoid adding extra fruit beyond the stated amount.
If you enjoy experimenting with desserts, this cake batter fudge is another sweet option for a dessert tray, although it has a completely different texture from this tender coffee cake.
Serving Suggestions
Serve slices slightly warm or at room temperature with coffee, black tea, or herbal tea. The cake is sweet enough to enjoy on its own, but a spoonful of unsweetened whipped cream or a little full-fat Greek yogurt makes a pleasant finishing touch.
For brunch, arrange the slices on a platter with extra fresh raspberries. The red berries against the golden crumb and cinnamon streusel make the cake look festive without requiring icing.
Although the recipe belongs in the Desserts category, it also works beautifully as a late-morning bake. If you are planning a larger spread, you may find our easy hot pepper jelly useful for a savory appetizer course before dessert.
Storage and Reheating
Cool the cake completely before storing it. Cover the pan or transfer slices to an airtight container and refrigerate for several days because the cake contains sour cream, eggs, and fresh fruit.
For the best flavor, let refrigerated slices sit at room temperature briefly before serving. You can also warm an individual slice gently, but avoid overheating it because the almond-flour crumb can become dry around the edges.
The cake may be portioned before storage, which makes it easy to enjoy one serving at a time. Place parchment between slices if you want to prevent the streusel from sticking to the next piece.
For a less expected meal-planning detour, our air fryer meatballs are a handy savory recipe to keep nearby; they are not part of this dessert, but they can round out a casual gathering menu.
Easy Low-Carb Raspberry Coffee Cake
Ingredients
Method
- Heat the oven to 350°F (175°C). Grease an 8-inch square baking pan or line it with parchment, leaving enough overhang to lift the cooled cake out.
- If using the streusel, combine the almond flour, low-carb sweetener, and cinnamon in a small bowl. Rub in the cold butter with your fingertips until coarse crumbs form, then set it aside.
- Whisk the almond flour, coconut flour, baking powder, and salt in a medium bowl. Break up any compacted pockets of flour so the dry ingredients distribute evenly.
- In a separate bowl, whisk the melted, slightly cooled butter, eggs, sour cream, sweetener, and vanilla until smooth. The butter should not be hot, as very hot butter can affect the eggs.
- Stir the dry ingredients into the wet mixture just until combined. Do not overmix, because a few strokes beyond incorporation can make the cake heavier.
- Pat the fresh raspberries dry and gently fold about three-quarters of them into the batter. Use a light touch so the berries stay mostly whole and do not release too much juice.
- Spread the batter evenly in the prepared pan. Scatter the remaining raspberries over the top, then sprinkle on the almond streusel if using.
- Bake for 35–45 minutes, until the center is set and a toothpick inserted into the cake portion comes out mostly clean. A few moist crumbs are normal, but the toothpick should not show wet batter.
- Cool the cake in the pan for at least 20–30 minutes before slicing. The almond-flour crumb is fragile while hot and firms noticeably as it cools.
Notes
Final Thoughts
This easy low-carb raspberry coffee cake is a dependable bake with a soft, buttery crumb, bright berry flavor, and an optional cinnamon-almond topping that makes every slice feel special. The method is uncomplicated, but careful measuring, gentle mixing, dry berries, and a patient cooling period make a noticeable difference.
Make it for a weekend breakfast, a relaxed afternoon coffee break, or a dessert table that needs something fresh and fruity. Once you taste the tender almond-flour cake with warm cinnamon streusel and tart raspberries, this simple recipe is likely to become a regular favorite.