1boxChocolate Cake MixPlus ingredients called for on the box (usually eggs, oil, and water).
1can (14 oz)Sweetened Condensed MilkRoom temperature for easier pouring.
1cupChocolate Syrup or Hot Fudge SauceWarmed slightly for easier spreading.
Whipped CreamFor serving, optional.
Chocolate Shavings or SprinklesOptional, for garnish.
Nonstick Cooking Spray or ButterFor greasing the pan.
1/2cupChopped Nuts (Walnuts or Pecans)Optional, toasted for texture.
Instructions
Preheat the oven according to the chocolate cake mix instructions (usually 350°F / 175°C). Grease a 9x13 inch baking pan with nonstick spray or butter.
Prepare the cake batter exactly as directed on the box using the specified eggs, oil, and water. Pour the batter into the prepared pan and spread evenly. Bake according to the package time, or until a toothpick inserted in the center comes out with just a few moist crumbs.
Remove the cake from the oven and allow it to cool for about 10 minutes. Use the end of a wooden spoon handle to poke holes all over the top of the cake about 1 inch apart.
Pour the sweetened condensed milk evenly over the top, ensuring it seeps into the holes. Use a spatula to guide milk into areas that need help.
Pour the chocolate syrup or warmed hot fudge sauce over the cake, spreading it gently with a spatula.
Allow the cake to cool completely at room temperature, then refrigerate for at least 2 hours (overnight is better) so the condensed milk and chocolate set into the cake.
Serve chilled or slightly chilled. Top with whipped cream, chocolate shavings, or chopped toasted nuts just before serving.
Notes
For the richest result, use hot fudge instead of chocolate syrup and fold in chocolate chips before pouring the sauce.