There is something deeply satisfying about a slice of mixed berry coffee cake with crumble topping on a slow weekend morning. The problem with most traditional versions is that they are loaded with refined flour, butter, and so much sugar that you feel sluggish before you have even finished your first cup of coffee. This recipe flips that script entirely. You get all the golden, crumbly, berry-studded joy you are craving, but built on a foundation that actually fuels your morning rather than derailing it.
The cake batter uses a blend of oat flour and whole wheat flour, which bumps up the fibre content significantly compared to standard all-purpose flour recipes. Plain Greek yogurt is the real hero here. It keeps the crumb incredibly moist and tender while adding a meaningful amount of protein to every slice. A small amount of coconut sugar and pure maple syrup provide just enough natural sweetness, cutting the sugar load by roughly half compared to classic coffee cake recipes. The berries do a lot of the heavy lifting flavour-wise too. A generous mix of fresh or frozen blueberries, raspberries, and blackberries brings natural sweetness, antioxidants, and gorgeous pockets of jammy fruit throughout every bite.
The crumble topping is where things get really exciting from a nutritional standpoint. Instead of the usual butter-and-white-sugar streusel, this version uses rolled oats, almond flour, a touch of coconut oil, cinnamon, and a small drizzle of maple syrup. It bakes up beautifully golden and crunchy, with a slightly nutty flavour that pairs perfectly with the tart berries underneath. Every bite has that satisfying contrast of crisp topping and soft, fruit-laden cake, exactly what you want from a great coffee cake. You would never guess it clocks in at under 240 calories per slice with nearly 9 grams of protein.
This mixed berry coffee cake with crumble topping is also brilliantly simple to put together. The batter comes together in about 15 minutes with one bowl and a whisk. You do not need a stand mixer or any special equipment. It bakes in a standard square tin, cuts into neat portions, and keeps well for several days, making it a brilliant option if you like to prep your breakfasts ahead of time. Serve it warm from the oven with a dollop of extra Greek yogurt on the side, or enjoy it at room temperature with your morning coffee. Either way, it delivers that cosy, bakery-style experience with genuinely good-for-you ingredients behind every forkful.
Ingredients
- 1 cup oat flour (certified gluten-free if needed; blend rolled oats in a blender to make your own)
- 3 cup whole wheat flour
- 1.5 tsp baking powder
- 1 tsp baking soda
- 1 tsp ground cinnamon
- 1 tsp fine sea salt
- 2 large eggs (at room temperature)
- 3 cup plain full-fat Greek yogurt (adds moisture and protein)
- 1 cup pure maple syrup
- 3 tbsp coconut sugar
- 3 tbsp melted coconut oil (or light olive oil)
- 1 tsp pure vanilla extract
- 2 tbsp unsweetened almond milk (or any milk of choice)
- 1.5 cups mixed berries (blueberries, raspberries, and blackberries; fresh or frozen (do not thaw if frozen))
- 1 tsp oat flour (for tossing the berries to prevent sinking)
- 2 cup rolled oats (old-fashioned, not instant)
- 1 cup almond flour (adds healthy fat and crunch to the crumble)
- 2 tbsp coconut sugar (for the crumble topping)
- 1 tsp ground cinnamon (for the crumble topping)
- 2.5 tbsp melted coconut oil (for the crumble topping)
- 1.5 tbsp pure maple syrup (for the crumble topping)
- 1 pinch fine sea salt (for the crumble topping)
Instructions
- 1
Preheat your oven to 175C (350F). Lightly grease a 9x9 inch square baking tin with coconut oil and line it with parchment paper, leaving some overhang on the sides for easy lifting.
Lining with parchment makes removing and slicing the cake much cleaner.
- 2
Make the crumble topping first. In a medium bowl, combine the rolled oats, almond flour, coconut sugar, cinnamon, and pinch of salt. Pour in the melted coconut oil and maple syrup and stir well until the mixture clumps together in small crumbles. Place the bowl in the fridge while you prepare the batter.
Chilling the crumble helps it hold its texture and bake up crunchier.
- 3
In a large mixing bowl, whisk together the eggs, Greek yogurt, maple syrup, coconut sugar, melted coconut oil, vanilla extract, and almond milk until smooth and well combined.
Make sure your eggs and yogurt are at room temperature for a smoother, lump-free batter.
- 4
Add the oat flour, whole wheat flour, baking powder, baking soda, cinnamon, and salt to the wet ingredients. Gently fold everything together with a spatula until just combined. Do not overmix. A few small lumps in the batter are completely fine.
Overmixing develops the gluten and can make the cake dense and tough.
- 5
Toss the mixed berries with 1 teaspoon of oat flour in a small bowl until lightly coated. This stops them from sinking straight to the bottom during baking. Gently fold two thirds of the berries into the batter, then pour the batter into the prepared tin and spread it evenly with a spatula.
If using frozen berries, add them directly from the freezer without thawing to prevent the batter turning purple.
- 6
Scatter the remaining berries over the top of the batter. Then take the chilled crumble topping out of the fridge and distribute it evenly over the surface of the cake, pressing it down very gently so it adheres.
Covering the surface fully ensures every slice gets a good amount of crumble.
- 7
Bake in the preheated oven for 35 to 38 minutes, until the crumble is deep golden brown and a toothpick inserted into the centre of the cake comes out clean or with just a few moist crumbs attached.
Start checking at 33 minutes as ovens can vary. Cover loosely with foil if the top browns too quickly.
- 8
Remove the cake from the oven and allow it to cool in the tin for at least 15 minutes before lifting it out using the parchment overhang. Slice into 9 even portions and serve warm or at room temperature.
The cake slices more cleanly once it has cooled slightly. Rushing this step can cause the slices to crumble.
Nutrition per serving
237kcal
Calories
8.6g
Protein
31g
Carbs
9.8g
Fat
3.9g
Fibre
13.2g
Sugar
178mg
Sodium
Pro Tips
- ✓
Use a mix of at least two or three different berries for the best layered flavour. Blueberries bring sweetness, raspberries bring tartness, and blackberries add depth.
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Do not skip tossing the berries in flour. It genuinely makes a difference to how evenly they distribute through the cake.
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Greek yogurt can vary in thickness between brands. If your batter feels very stiff, add an extra tablespoon of almond milk to loosen it slightly.
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This cake is naturally sweetened, so it is noticeably less sweet than a traditional coffee cake. If you prefer a slightly sweeter result, increase the maple syrup by one additional tablespoon.
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For a neat finish, use a sharp serrated knife to slice the cake once it has cooled fully.
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The crumble topping is delicate when warm. Handle slices with care until the cake has cooled for at least 20 minutes.
Frequently Asked Questions
Variations
- •
Lemon Berry Coffee Cake
Add the zest of one large lemon and one tablespoon of fresh lemon juice to the wet batter ingredients. The citrus cuts through the sweetness of the berries beautifully and gives the cake a bright, fresh flavour.
- •
Single Berry Version
Use only blueberries for a classic blueberry coffee cake feel, or only raspberries for a more intensely tart result. Both work brilliantly with the oat crumble topping.
- •
Vanilla Protein Boost
Stir one scoop of unflavoured or vanilla protein powder into the dry ingredients. You may need to add an extra two tablespoons of almond milk to compensate for the added dryness. This brings each slice to around 13 grams of protein.
- •
Spiced Autumn Version
Add half a teaspoon of ground ginger and a quarter teaspoon of ground nutmeg to the batter alongside the cinnamon. Swap the mixed berries for a combination of diced apple and fresh cranberries for a cosy autumn-inspired twist.
Substitutions
- •Greek yogurt → Plain coconut yogurt or thick dairy-free soy yogurt (Use the same quantity. Choose an unsweetened, full-fat variety for the closest texture result.)
- •Whole wheat flour → Gluten-free all-purpose flour blend or additional oat flour (Use a one-to-one swap. The texture may be slightly denser with all oat flour but still delicious.)
- •Coconut oil → Light olive oil or avocado oil (Both work as a one-to-one swap in both the batter and crumble topping. Avocado oil has the most neutral flavour.)
- •Maple syrup → Raw honey (Use the same quantity. Honey will make the cake slightly denser and adds a floral sweetness that works well with berries.)
- •Almond flour (in crumble) → Finely chopped walnuts or sunflower seed flour (Chopped walnuts give a chunkier, more rustic crumble. Sunflower seed flour keeps it nut-free with a similar texture to almond flour.)
- •Almond milk → Oat milk, soy milk, or regular dairy milk (Any milk works here as the quantity is small and used only to adjust batter consistency.)
🧊 Storage
Store cooled slices in an airtight container at room temperature for up to two days, or in the fridge for up to five days. The crumble topping softens slightly in the fridge, so if you want to restore some crunch, warm slices in a 160C (325F) oven for five minutes or pop them in an air fryer for two to three minutes before serving.
📅 Make Ahead
You can prepare the crumble topping up to three days in advance and store it in an airtight container in the fridge. The dry batter ingredients can also be measured and mixed together the night before, kept covered at room temperature, with the wet ingredients mixed in fresh the next morning. The fully baked cake also freezes well. Wrap individual slices tightly in cling film and freeze for up to two months. Thaw overnight in the fridge or warm from frozen in a low oven.
