Blueberry Lemon Cashew Crumble Squares

My kitchen smelled like a lemon grove collided with a berry patch, and honestly, I was not mad about it. The oven hummed along while I pressed oat crumble into a pan with fingers sticky from coconut oil, wondering if this wild experiment would actually work. It did, and the first bite was a revelation of tangy, creamy, crunchy perfection that I have been chasing ever since.

I brought a pan of these to a potluck last summer and watched a woman close her eyes after her first bite, then immediately ask for the recipe. She had been dairy free for years and said these were the best dessert squares she had ever tasted. I floated home on that compliment for about a week.

Ingredients

• Rolled oats: They give the crust and crumble their hearty, chewy texture, and certified gluten free oats make this safe for sensitive guests.
• Almond flour: Adds tenderness and a subtle nuttiness that plain flour never could.
• Coconut sugar: A deep, caramel like sweetness that pairs beautifully with the bright lemon and berries.
• Coconut oil, melted: Binds the crumble together without butter and helps achieve that golden bake.
• Raw cashews, soaked: The backbone of the cream layer, they blend into something shockingly silky after a good soak.
• Coconut cream: Makes the cashew layer lush and spreadable, and adds a gentle richness.
• Fresh lemon juice and zest: Use real lemons here, not bottled juice, because the zest carries all the fragrant oils that make this recipe sing.
• Maple syrup: Sweetens both the cream and the blueberry filling with a warm, round flavor.
• Blueberries: Fresh or frozen both work beautifully, though frozen will release more juice and create a jammy filling.
• Arrowroot starch: Thickens the blueberry filling just enough so it sets without turning gummy.

Instructions

Set the stage:

Preheat your oven to 350°F and line an 8x8 pan with parchment, leaving overhang on the sides so you can lift the whole thing out later like a pro.

Build the crumble base:

Stir together the oats, almond flour, coconut sugar, salt, and baking powder in a big bowl, then pour in the melted coconut oil and vanilla and work it with your fingers until everything looks like wet sand with some chunky bits.

Press and parbake the crust:

Scoop out three quarters of a cup of that mixture and set it aside for the topping, then press the rest firmly and evenly into your pan and bake for 10 minutes until it just starts to smell toasty.

Whip up the cashew cream:

While the crust bakes, throw your soaked cashews, maple syrup, coconut cream, lemon juice, zest, vanilla, and a pinch of salt into a high speed blender and run it until the mixture is completely velvety with no grainy bits.

Layer the cream:

Pour that gorgeous cashew cream over the warm crust and spread it out in an even layer, trying not to snack on it straight from the blender.

Prepare the blueberry filling:

Toss the blueberries with lemon zest, lemon juice, maple syrup, and arrowroot starch in a bowl until every berry is coated, then scatter them evenly over the cream layer.

Top with crumble and bake:

Sprinkle the reserved crumble mixture over the top, slide the pan into the oven, and bake for 30 minutes until the edges are bubbling and the crumble has turned a lovely golden brown.

Cool and chill completely:

Let the pan cool to room temperature on the counter, then transfer it to the fridge for at least 2 hours before slicing so everything sets up into perfect, clean squares.

Save

There is something deeply satisfying about lifting that parchment sling out of the pan and revealing perfect, layered squares that look like they came from a bakery.

Tools That Make This Easier

A high speed blender is your best friend here for getting that cashew cream truly smooth, though a food processor will work if you let it run a little longer. An 8x8 baking pan is the perfect size for squares that are thick enough to feel substantial but not so tall they fall apart. Keep a spatula handy for spreading the cream layer evenly.

Making It Your Own

Raspberries or blackberries swap in beautifully for the blueberries if you want to mix things up. A pinch of cardamom in the crumble adds a warm, unexpected note that pairs wonderfully with the lemon.

Serving and Storing

These squares keep beautifully in the fridge for up to five days, and they actually taste better on day two when the layers have had time to mingle. For clean slices, use a sharp knife wiped clean between each cut.

• They are lovely slightly chilled alongside a cup of herbal tea or a glass of Moscato.
• Freeze individual squares between layers of parchment for a grab and go treat that thaws in about 20 minutes.
• Always check your oat and vanilla labels if serving to someone with gluten sensitivities.

Save

These blueberry lemon cashew cream crumble squares are proof that plant based desserts can be every bit as indulgent and memorable as their traditional counterparts. Share them generously and watch the smiles multiply.

Recipe Questions & Answers

→ Can I use frozen blueberries instead of fresh?

Yes, frozen blueberries work perfectly. Do not thaw them before using — toss them directly with the lemon zest, juice, maple syrup, and arrowroot starch. You may need to add 2 to 3 extra minutes to the baking time.

→ How long should I soak the cashews?

Soak raw cashews for at least 4 hours in room-temperature water, or cover them with boiling water for 30 minutes as a quick alternative. Properly soaked cashews blend into a completely smooth, velvety cream.

→ Why do the squares need to chill before slicing?

Chilling for at least 2 hours allows the cashew cream layer and blueberry filling to set firmly. Cutting while warm or at room temperature will cause the layers to spread and the squares to lose their clean shape.

→ Can I substitute the coconut sugar or maple syrup?

Coconut sugar can be replaced with brown sugar in the crust and crumble. Maple syrup in the filling can be swapped with agave nectar or honey if you are not strictly vegan. Keep in mind that substitutions may slightly alter the flavor and texture.

→ How should I store leftover squares?

Store the squares in an airtight container in the refrigerator for up to 5 days. For longer storage, freeze them individually wrapped for up to 2 months. Thaw overnight in the refrigerator before serving.

→ What can I use instead of arrowroot starch?

Cornstarch is the most straightforward substitute, using the same amount. Tapioca starch also works well. All three will effectively thicken the blueberry filling without affecting the flavor.