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Oven Preparation: Begin by preheating your oven to 350°F (177°C). Place the butter in a 9×13-inch baking dish and set it in the oven to melt. Once melted, remove the dish and set aside.
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Batter Preparation: In a mixing bowl, combine 1 1/2 cups of granulated sugar with 4 tablespoons of cocoa powder, flour, baking powder, and salt. Gradually add milk and vanilla extract, stirring until the mixture is smooth. Pour this batter over the melted butter in the baking dish, taking care not to stir the layers together.
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Topping Preparation: In a separate bowl, mix together 2 cups of sugar with 1/2 cup of cocoa powder. Evenly sprinkle this mixture over the batter in the baking dish. Carefully pour boiling water over the sugar-cocoa layer, ensuring not to stir so as to maintain distinct layers.
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Baking: Place the baking dish in the preheated oven and bake for 35-40 minutes, or until the surface has set but the bottom remains soft and somewhat fluid.
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Cooling and Serving: Allow the cobbler to cool for approximately 15 minutes before serving. This resting period helps the dessert to set slightly, making it easier to serve. Serve warm, accompanied by a scoop of vanilla ice cream.