Strawberry Lemon Cashew Crumble Squares

My kitchen smelled like a summer farmers market the afternoon these squares came together, strawberries macerating on the cutting board while lemon zest curled under my microplane. I was attempting something ambitious for a backyard potluck, layering textures the way a sandwich shop stacks flavors: crumbly, creamy, jammy. The oven had barely cooled before I cut a corner piece to test, telling myself it was quality control. That first bite convinced me this recipe was a keeper.

I brought the whole pan to my neighbor Elles potluck last June, sliding it onto a table crowded with store bought brownies and fruit platters. People hovered near the dessert station, asking which bakery I had ordered from. When I admitted they were homemade and vegan, Elle grabbed a second square and declared she was keeping the leftovers. The pan came back empty, a few stray crumbs proof anything had existed at all.

Ingredients

• Rolled oats (1 1/2 cups): Old fashioned oats give the crumble its hearty chew; certified gluten free oats keep it safe for sensitive friends.
• Almond flour (1 cup): This binds the crumble without wheat flour and adds a subtle nuttiness that pairs beautifully with the lemon layer.
• Coconut sugar (1/2 cup): It caramelizes in the oven, deepening the crumble flavor in a way white sugar simply cannot match.
• Sea salt (1/2 teaspoon plus 1/4 teaspoon): A pinch in each layer balances sweetness and makes the strawberry flavor pop.
• Ground cinnamon (1/2 teaspoon): Just enough warmth to bridge the oats and berries without overpowering the lemon.
• Coconut oil, melted (1/2 cup): Helps the crumble turn golden and crisp; measure it after melting for accuracy.
• Maple syrup (2 tablespoons plus 2 tablespoons plus 2 tablespoons): Divided among the crumble, berries, and cream for rounded sweetness throughout every layer.
• Fresh strawberries, hulled and chopped (2 cups): Peak season berries make all the difference here so use the reddest, ripest ones you can find.
• Cornstarch (2 teaspoons): Thickens the strawberry juices so the middle layer holds together instead of turning soup.
• Lemon zest (1 teaspoon plus 1 teaspoon): Split between the berries and the cream for brightness that runs through the whole square.
• Raw cashews, soaked and drained (1 cup): Soak them at least two hours so they blend into silk; overnight is even better.
• Freshly squeezed lemon juice (1/4 cup): Bottled juice tastes flat and metallic here so squeeze it fresh.
• Vanilla extract (1 teaspoon): Rounds out the tang of the lemon and ties the cream to the sweeter layers.
• Water (2 to 3 tablespoons): Added gradually to help the cashew cream reach a spreadable consistency.

Instructions

Preheat and prep:

Set your oven to 350 degrees F and line an 8 by 8 inch pan with parchment, leaving enough overhang to lift the whole thing out later. This single step saves you from the heartbreak of squares crumbling when you try to dig them out.

Build the crumble:

Toss oats, almond flour, coconut sugar, salt, and cinnamon in a large bowl until evenly mixed. Pour in melted coconut oil and maple syrup, stirring until everything looks like wet sand with some pebble sized clumps. Scoop out one cup and set it aside for the topping.

Press the base:

Firmly press the remaining crumble mixture into the bottom of your lined pan using your palms or the back of a measuring cup. Pack it tightly because a loose base means your squares will fall apart when sliced.

Macerate the berries:

In a small bowl, gently fold chopped strawberries with maple syrup, cornstarch, and lemon zest until every piece is coated. Spread this mixture in an even layer over the pressed base, letting the juices seep into the oats beneath.

Blend the cream:

Drain your soaked cashews and add them to a high speed blender with lemon juice, maple syrup, vanilla, salt, water, and lemon zest. Blend on high until completely smooth, scraping down the sides once or twice, adding another tablespoon of water only if it refuses to spread.

Layer the cream:

Pour the lemon cashew cream over the strawberry layer and use a spatula to nudge it into the corners. The cream will look thick and glossy, like frosting you want to eat straight from the blender.

Add the topping:

Crumble the reserved oat mixture over the cream in uneven chunks, some small and some slightly larger for texture contrast. Do not press it down or you will lose that beautiful golden crispness.

Bake until golden:

Slide the pan into the oven and bake for 35 minutes, rotating once halfway through. You will know it is ready when the topping turns deep gold and you see the strawberry juices bubbling at the edges.

Cool and slice:

Let the pan cool completely at room temperature, then refrigerate for at least one hour before lifting the whole block out with the parchment overhang and cutting into 12 neat squares. Patience here gives you those clean bakery worthy edges.

Save

There is something quietly satisfying about lifting that parchment sling out of the pan and seeing three perfect stripes of color: golden oats, ruby strawberries, and pale lemon cream. I once caught my roommate standing at the open fridge at midnight, eating a square straight from the container with her fingers. She looked at me, looked at the square, and said nothing, which was honestly the best review I have ever received.

Making It Your Own

Swapping strawberries for raspberries or a mixed berry blend works beautifully, though raspberries break down faster so watch the bake time. A friend stirred matcha powder into the cashew cream once and the earthy green color against red berries looked stunning on a dessert board. You could also fold a quarter cup of chopped pecans into the reserved topping for extra crunch if you want something more rustic and hearty.

Storage That Actually Works

These squares hold their shape best when stored in an airtight container in the fridge, where they stay fresh for up to five days. The oat topping softens slightly overnight but never turns soggy, which makes them excellent for making ahead. I have tried freezing them individually wrapped and they thaw beautifully at room temperature within an hour, though the cream layer firms up a bit more than I prefer.

Serving Ideas Worth Trying

A warm square with a scoop of coconut milk ice cream on top turns this from an afternoon snack into a proper dessert moment. I once arranged them on a wooden board with fresh berries and lemon wedges for a bridal shower and they disappeared before the cake was even cut.

• Dust the tops with powdered sugar right before serving for a polished look.
• Pair with sparkling lemonade or iced chamomile tea for a cohesive flavor experience.
• Always serve chilled because the layers hold their definition best straight from the fridge.

Save

Every time I make these squares I think about how a few humble ingredients can stack into something that feels genuinely special. Share them with someone you like, or quietly keep the whole pan in your fridge.

Recipe Questions & Answers

→ Can I use frozen strawberries instead of fresh?

Yes, frozen strawberries work well when fresh aren't in season. Thaw them completely and drain off any excess liquid before tossing with the cornstarch and maple syrup. This prevents the filling from becoming too watery during baking.

→ How long should I soak the cashews?

Soak raw cashews for at least 2 hours in room-temperature water, or cover them with boiling water for 30 minutes as a quicker alternative. Properly softened cashews blend into a completely smooth, creamy layer without any graininess.

→ Why do the squares need to chill before slicing?

Refrigerating for at least 1 hour allows the lemon cashew cream and strawberry filling to firm up, giving you clean, sharp edges when cutting. Slicing while still warm will cause the layers to smear and slide apart.

→ How should I store leftover squares?

Store them in an airtight container in the refrigerator for up to 5 days. The oat crumble softens slightly over time but the flavors continue to develop. You can also freeze individual squares wrapped tightly for up to 2 months.

→ Can I make this nut-free?

The cashew cream and almond flour are central to the texture, so a fully nut-free version requires substitutions. Try sunflower seeds blended the same way as the cashew cream, and swap almond flour for oat flour. Note that the flavor profile will shift considerably.

→ What can I add for extra crunch in the crumble?

Stir in ¼ cup of chopped pecans, walnuts, or even shredded coconut to the crumble mixture before pressing it into the pan and sprinkling on top. This adds a lovely toasty texture that complements the creamy layers beautifully.