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U.S. measurements first, metric equivalents in parentheses. Conversions are approximate; oz means weight ounces, not fluid ounces.
1 cup (120 g) all-purpose flour 3 / 4 cup (150 g) granulated sugar 2 tbsp (15 g) unsweetened cocoa powder 2 tsp (10 ml) baking powder 1 / 4 tsp (1.25 ml) salt 1 / 2 cup (120 ml) whole milk 2 tbsp (30 g) unsalted butter, melted 1 tsp (5 ml) vanilla extract 1 / 2 cup (90 g) semisweet chocolate chips (optional) 1 cup (220 g) light brown sugar, packed 1 / 4 cup (20 g) unsweetened cocoa powder (for topping) 1 1 / 4 cups (300 ml) very hot coffee or water Vanilla ice cream, for serving (optional)
1 cup (120 g) all-purpose flour 3 / 4 cup (150 g) granulated sugar 2 tbsp (15 g) unsweetened cocoa powder 2 tsp baking powder 1 / 4 tsp salt 1 / 2 cup (120 ml) whole milk 2 tbsp (30 g) unsalted butter, melted 1 tsp vanilla extract 1 / 2 cup (90 g) semisweet chocolate chips (optional) 1 cup (220 g) light brown sugar, packed 1 / 4 cup (20 g) unsweetened cocoa powder (for topping) 1 1 / 4 cups (300 ml) very hot coffee or water Vanilla ice cream, for serving (optional)
U.S. measurements first, metric equivalents in parentheses. Conversions are approximate.
Preheat oven to 350°F. Lightly grease an 8-inch (20 cm) square baking pan or 9-inch (23 cm) round pan. Make the batter: In a medium bowl, whisk flour, granulated sugar, 2 tablespoons (30 ml) cocoa, baking powder, and salt. Add milk, melted butter, and vanilla. Stir just until combined, then fold in chocolate chips if using. Spread evenly in the prepared pan. Make the topping: In a small bowl, mix the brown sugar and 1/4 cup (60 ml) cocoa. Sprinkle this mixture evenly over the batter—do not stir. Slowly pour the very hot coffee or water over the entire surface. Do not stir; the liquid will sink and create the fudge sauce underneath as it bakes. Bake 30–35 minutes, until the top looks set and cake-like but you can see bubbling sauce around the edges. Cool 10–15 minutes. To serve, scoop portions so you get both cake and hot fudge sauce from the bottom. Serve warm with vanilla ice cream if desired.
Preheat oven to 350°F. Lightly grease an 8-inch square baking pan or 9-inch round pan. Make the batter: In a medium bowl, whisk flour, granulated sugar, 2 tablespoons cocoa, baking powder, and salt. Add milk, melted butter, and vanilla. Stir just until combined, then fold in chocolate chips if using. Spread evenly in the prepared pan. Make the topping: In a small bowl, mix the brown sugar and 1/4 cup cocoa. Sprinkle this mixture evenly over the batter—do not stir. Slowly pour the very hot coffee or water over the entire surface. Do not stir; the liquid will sink and create the fudge sauce underneath as it bakes. Bake 30–35 minutes, until the top looks set and cake-like but you can see bubbling sauce around the edges. Cool 10–15 minutes. To serve, scoop portions so you get both cake and hot fudge sauce from the bottom. Serve warm with vanilla ice cream if desired.
Per serving | Servings: 6
Nutrition estimated: November 5, 2026
*Values are estimates based on USDA data and mathematical calculations. Actual values may vary. Where data are unavailable, those contributions are excluded. Calories, Carbohydrates, Protein, Fat, Saturated fat, Cholesterol, Fiber, Sugar, Sodium, Potassium, Calcium, Iron, Vitamin A and Vitamin D are known subtotals. Missing contributions are unknown, not zero.