Chocolate Dump-It Cake recipe - from the The Ultimate Donovan Family Reunion Cookbook Family Cookboo

Ingredients

• 2 cups sugar
• 4 ounces unsweetened chocolate
• 1/4 pound unsalted butter (1 stick), plus more for greasing the pan
• 2 cups all-purpose flour, plus more for dusting the pan
• 2 teaspoons baking soda
• 1 teaspoon baking powder
• 1 teaspoon semi-coarse sea salt or kosher salt
• 1 cup milk
• 1 teaspoon cider vinegar
• 2 eggs
• 1 teaspoon vanilla extract
• 1 1/2 cups Nestle semi-sweet chocolate chips
• 1 1/2 cups sour cream, at room temperature