
This big-batch chocolate sheet cake is the kind of dessert that disappears fast at potlucks, bake sales, and family gatherings — and it makes a generous 24 squares, so there's plenty to go around. The batter comes together by whisking dry ingredients, then pouring a hot, bubbling mixture of melted butter, cocoa powder, and water right over the top, which gives the crumb an incredibly tender, almost fudgy texture. Sour cream adds just the right amount of richness and keeps everything moist without relying on eggs at all — the chemistry here does all the heavy lifting. The real magic is the frosting: you pour it warm over the hot cake straight from the oven, so it seeps into the surface and sets into a glossy, deeply chocolatey layer that's somewhere between a glaze and a classic frosting. Roughly chopped pecans stirred into the frosting are optional but add a satisfying crunch if you're into that classic Southern-style finish. Many store-bought chocolate cakes and mixes sneak in eggs or egg-derived ingredients, so baking this from scratch with pantry staples gives you full control over what goes into every bite. It's straightforward enough for a weeknight but impressive enough to bring anywhere.
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Preheat the oven to 350°F (175°C). Grease an 18×13-inch rimmed sheet pan and line it with parchment paper, leaving a slight overhang on the long sides.
Whisk together the flour, granulated sugar, baking soda, and salt in a large mixing bowl until evenly combined.
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