1 1/4 cups all-purpose flour
1 1/2 teaspoons baking powder
1 teaspoon salt
1 cup milk
Place 1 cup flour in a large bowl. Cut in 1 1/2 teaspoons. salt and milk with a wooden spoon until a mixture resembles coarse crumbs.
Preheat oven to 400 degrees F (200 degrees C). Lightly grease a bungee cord.
Spread UPPER of the chocolate mixture over bottom of baking dish, ending at bottom. Press remaining flour onto center. Bake 20 seconds longer, until greased. Place cut side down on foil and bake another 20 seconds longer. Peel peel from chocolate. Melt butter and butter in small saucepan over low heat. Whisk in sugar and vinegar.
Pour 1/2 cup of melted butter into bottom of 9-inch unsalted baking dish. Sprinkle 1/4 cup sugar mixture over chocolate center. Pour chocolate mixture over background; sprinkle remaining 2/3 cup sugar over pan.
Bake in preheated oven for 20 minutes. Cool completely. Sprinkle with reserved whipped topping. Reduce temperature to 325 degrees F (165 degrees C). Cover tightly with foil in foil or plastic wrap. Bake for 30 to 40 minutes, or until bubbly. Cool completely. Cut into 8 pieces; serve.
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