Pistachio Oat Squares Recipe
Buttery, crumbly oat bars filled with a sweet pistachio layer and finished with a delicate nutty streusel create the perfect balance of chewy and crunchy textures.
Ingredients
<ul class="ingredients-main-list"><li class="ingredients-single-item">For the base and topping:</li><li class="ingredients-single-item">200g rolled oats</li><li class="ingredients-single-item">150g all-purpose flour</li><li class="ingredients-single-item">150g brown sugar</li><li class="ingredients-single-item">1/4 teaspoon salt</li><li class="ingredients-single-item">175g unsalted butter, cold and cubed</li><li class="ingredients-single-item">For the pistachio filling:</li><li class="ingredients-single-item">150g shelled pistachios (unsalted)</li><li class="ingredients-single-item">100g granulated sugar</li><li class="ingredients-single-item">60g unsalted butter, softened</li><li class="ingredients-single-item">1 large egg</li><li class="ingredients-single-item">1 teaspoon vanilla extract</li><li class="ingredients-single-item">30g all-purpose flour</li><li class="ingredients-single-item">1/4 teaspoon salt</li><li class="ingredients-single-item">Few drops green food coloring (optional)</li></ul>
Equipment
<ul class="equipment-main-list"><li class="equipment-single-item">23cm (9-inch) square baking tin</li><li class="equipment-single-item">Food processor</li><li class="equipment-single-item">Parchment paper</li></ul>
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Directions
<ol class="no-list-style"><li class="MethodStepper"><h4 class="step-title">Step 1</h4>Preheat your oven to 180°C (350°F). Line your 23cm square baking tin with parchment paper, leaving some overhang on the sides to easily lift the bars out later.</li><li class="MethodStepper"><h4 class="step-title">Step 2</h4>For the base and topping, combine the rolled oats, flour, brown sugar, and salt in a large bowl. Add the cold cubed butter and work it into the dry ingredients using your fingertips until the mixture resembles coarse crumbs. The cold butter will create pockets of steam during baking, resulting in a tender, flaky texture.</li><li class="MethodStepper"><h4 class="step-title">Step 3</h4>Press about two-thirds of the oat mixture firmly into the lined baking tin to form an even base. Use the bottom of a measuring cup to really compact the mixture – this will prevent a crumbly base that falls apart when served. Reserve the remaining third for the topping.</li><li class="MethodStepper"><h4 class="step-title">Step 4</h4>Pre-bake the base for 10 minutes until just beginning to set but not brown. This partial bake ensures your base will be perfectly cooked when the entire square is done.</li><li class="MethodStepper"><h4 class="step-title">Step 5</h4>Meanwhile, prepare the pistachio filling. In a food processor, pulse the pistachios until finely ground but not turning into butter. You're looking for the texture of coarse sand with some slightly larger pieces for texture.</li><li class="MethodStepper"><h4 class="step-title">Step 6</h4>In a medium bowl, cream together the softened butter and granulated sugar until light and fluffy. Beat in the egg, vanilla extract, and green food coloring (if using). Fold in the ground pistachios, flour, and salt until just combined. The mixture should be a spreadable consistency – not too runny or too thick.</li><li class="MethodStepper"><h4 class="step-title">Step 7</h4>When the base is pre-baked, remove from the oven and immediately spread the pistachio filling evenly over the warm base. Work gently so you don't disturb the partially set base layer.</li><li class="MethodStepper"><h4 class="step-title">Step 8</h4>Sprinkle the reserved oat mixture evenly over the top of the pistachio layer, gently pressing down just slightly so it adheres to the filling but still maintains its crumbly appearance.</li><li class="MethodStepper"><h4 class="step-title">Step 9</h4>Return to the oven and bake for 25-30 minutes until the topping is golden brown and the filling appears set. You'll know it's done when the edges are slightly pulling away from the sides of the tin.</li><li class="MethodStepper"><h4 class="step-title">Step 10</h4>Allow the squares to cool completely in the tin placed on a wire rack – this is crucial as the filling needs to set properly, which happens as it cools. For clean cuts, refrigerate for at least 1 hour before cutting.</li><li class="MethodStepper"><h4 class="step-title">Step 11</h4>Once completely cool, use the parchment paper overhang to lift the entire slab out of the tin. With a sharp knife, cut into 16 equal squares, wiping the knife clean between cuts for the most professional finish.</li><li class="MethodStepper"><h4 class="step-title">Step 12</h4>Store in an airtight container at room temperature for up to 4 days, or freeze for up to 3 months. If freezing, place parchment paper between layers to prevent sticking.</li></ol>
Chef’s Notes
A few helpful details for making this recipe.
Can I make these pistachio bars ahead of time for a party?
Absolutely! These squares are perfect for make-ahead situations. They store well in an airtight container at room temperature for up to 4 days or can be frozen for up to 3 months. If freezing, separate layers with parchment paper to prevent sticking.
What makes the perfect texture for oat crumble bars?
The perfect texture comes from using cold butter in the oat mixture (creating flaky pockets during baking), firmly pressing the base layer, pre-baking it slightly, and allowing the bars to cool completely before cutting. Refrigeration before cutting also helps achieve clean slices.
Is there a way to make these nutty squares without a food processor?
Yes! If you don't have a food processor, you can finely chop the pistachios by hand or use a blender on pulse mode. Alternatively, purchase pre-ground pistachios from specialty shops. Just ensure the nuts are ground to a coarse sand-like texture, not a paste.
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