Marble Sheet Cake Recipe

<ul class="ingredients-main-list"><li class="ingredients-single-item">225g unsalted butter, softened</li><li class="ingredients-single-item">300g granulated sugar</li><li class="ingredients-single-item">4 large eggs, room temperature</li><li class="ingredients-single-item">2 tsp vanilla extract</li><li class="ingredients-single-item">250g all-purpose flour</li><li class="ingredients-single-item">2 tsp baking powder</li><li class="ingredients-single-item">1/2 tsp salt</li><li class="ingredients-single-item">180ml whole milk, room temperature</li><li class="ingredients-single-item">30g cocoa powder, unsweetened</li><li class="ingredients-single-item">60ml hot water</li><li class="ingredients-single-item">For the ganache (optional):</li><li class="ingredients-single-item">100g dark chocolate, chopped</li><li class="ingredients-single-item">100ml heavy cream</li></ul>

<ul class="equipment-main-list"><li class="equipment-single-item">33x23cm (13x9-inch) baking pan</li><li class="equipment-single-item">Parchment paper</li><li class="equipment-single-item">Electric mixer (stand or hand)</li><li class="equipment-single-item">Rubber spatula</li><li class="equipment-single-item">Skewer or knife (for marbling)</li></ul>

<ol class="no-list-style"><li class="MethodStepper"><h4 class="step-title">Step 1</h4>Preheat your oven to 175°C (350°F). Line your 33x23cm baking pan with parchment paper, leaving some overhang on the sides for easy removal. Lightly grease any exposed parts of the pan.</li><li class="MethodStepper"><h4 class="step-title">Step 2</h4>In a small bowl, mix the cocoa powder with hot water until smooth and completely dissolved. This blooms the cocoa, intensifying its flavor and ensuring no dry cocoa pockets remain in your finished cake. Set aside to cool slightly.</li><li class="MethodStepper"><h4 class="step-title">Step 3</h4>In a medium bowl, whisk together the flour, baking powder, and salt. Proper mixing of dry ingredients ensures even distribution of leavening agents, resulting in a uniform rise.</li><li class="MethodStepper"><h4 class="step-title">Step 4</h4>In a large bowl, cream the softened butter and sugar together until light and fluffy, about 3-4 minutes. This process is crucial as it creates tiny air pockets that will expand during baking, giving your cake lift and tenderness. Don't rush this step!</li><li class="MethodStepper"><h4 class="step-title">Step 5</h4>Add eggs one at a time, beating well after each addition. Scrape down the sides of the bowl periodically to ensure everything is incorporated. Then mix in the vanilla extract. The mixture may look slightly curdled at this point, but don't worry - it will come together when you add the dry ingredients.</li><li class="MethodStepper"><h4 class="step-title">Step 6</h4>Gradually add the flour mixture to the butter mixture in three additions, alternating with the milk (beginning and ending with flour). Mix on low speed just until combined after each addition. Overmixing at this stage can activate too much gluten in the flour, resulting in a tough cake.</li><li class="MethodStepper"><h4 class="step-title">Step 7</h4>Transfer about one-third of the batter to a separate bowl and stir in the cooled cocoa mixture until fully incorporated. You should now have two bowls: one with vanilla batter and one with chocolate batter.</li><li class="MethodStepper"><h4 class="step-title">Step 8</h4>Dollop alternating spoonfuls of vanilla and chocolate batters into your prepared pan in a checkerboard pattern. When all the batter is in the pan, use a skewer or knife to swirl the batters together with a light hand. Don't overmix - just 8-10 figure-eight motions should create beautiful marbling without muddying the distinct flavors.</li><li class="MethodStepper"><h4 class="step-title">Step 9</h4>Bake in the preheated oven for 30-35 minutes, or until a toothpick inserted into the center comes out clean or with a few moist crumbs (not wet batter). The cake will also begin to pull away slightly from the sides of the pan when done.</li><li class="MethodStepper"><h4 class="step-title">Step 10</h4>Allow the cake to cool in the pan for 15 minutes, then use the parchment paper overhang to carefully lift it out and transfer to a wire rack to cool completely. Patience here results in a cleaner cut and better texture!</li><li class="MethodStepper"><h4 class="step-title">Step 11</h4>For the optional ganache, heat the heavy cream until just simmering (not boiling). Pour over the chopped chocolate and let sit for 2-3 minutes, then stir until smooth and glossy. Allow to cool slightly until it reaches your desired consistency - thinner for drizzling or thicker for spreading. Pour or spread over the cooled cake.</li><li class="MethodStepper"><h4 class="step-title">Step 12</h4>Cut into squares and serve. This cake keeps well at room temperature in an airtight container for up to 3 days, or refrigerated for up to 5 days. You can even freeze slices wrapped tightly in plastic wrap for up to 2 months!</li></ol>