Imagine diving into a warm, gooey cake, where every bite is a delightful blend of rich chocolate, creamy vanilla, and the unmistakable joy of a classic sundae. This Hot Fudge Sundae Cake is a dessert that combines the best of both worlds: cake and sundae. It’s perfect for family gatherings, dinner parties, or even a cozy night in when you need a sweet treat. With its simple ingredients and straightforward preparation, this cake will become a staple in your baking repertoire.
Why You’ll Keep Making It

There are countless reasons to fall in love with this Hot Fudge Sundae Cake. Firstly, it’s incredibly easy to make, requiring just a handful of pantry staples. Secondly, the flavor combination is irresistible—who can resist the rich taste of chocolate paired with a scoop of ice cream? Lastly, it’s a showstopper that impresses guests without demanding hours in the kitchen. Once you serve this cake, you’ll be greeted with oohs and aahs, and you might just find yourself making it again and again.
Ingredient Breakdown
To create this decadent Hot Fudge Sundae Cake, you will need:
- 1 cup all-purpose flour – The foundation of your cake, giving it structure and texture.
- 1/2 cup cocoa powder (divided in half) – Adds that rich chocolate flavor, and helps create the fudge sauce.
- 1 cup granulated sugar – Sweetness is essential, balancing the deep flavors of chocolate.
- 2 teaspoons baking powder – This leavening agent helps the cake rise and become fluffy.
- 1 cup whole milk – Moisture is key; milk keeps the cake tender and adds richness.
- 2 tablespoons melted butter – For a luscious texture and a hint of buttery flavor.
- 2 teaspoons vanilla extract – An essential flavor that enhances the cake’s sweetness.
- 1 cup semi-sweet chocolate chips – These create pockets of melted chocolate throughout the cake.
- 1 cup packed light brown sugar – For depth of flavor and a hint of caramel sweetness.
- 1 cup hot water – This final addition helps create the gooey fudge layer beneath the cake.
Appliances & Accessories
Make sure you have the following on hand to make your Hot Fudge Sundae Cake:
- Mixing bowls – For combining your ingredients.
- Whisk – To blend the batter smoothly.
- 9×13-inch baking dish – The perfect size for this cake.
- Measuring cups and spoons – Accurate measurements are crucial for baking success.
- Spatula – To scrape down the sides of your mixing bowl and ensure everything is combined.
- Oven – To bake your cake to perfection.
Directions: Hot Fudge Sundae Cake

Step 1: Preheat the Oven
Begin by preheating your oven to 350°F (175°C). This ensures the cake bakes evenly.
Step 2: Prepare the Baking Dish
Lightly grease a 9×13-inch baking dish with cooking spray or butter. This prevents the cake from sticking.
Step 3: Mix the Dry Ingredients
In a mixing bowl, combine the all-purpose flour, 1/4 cup cocoa powder, granulated sugar, baking powder, and a pinch of salt. Whisk these together until well blended.
Step 4: Add the Wet Ingredients
Pour in the whole milk, melted butter, and vanilla extract. Mix until just combined, being careful not to overmix.
Step 5: Stir in the Chocolate Chips
Fold in the semi-sweet chocolate chips, ensuring they are evenly distributed throughout the batter.
Step 6: Pour the Batter into the Dish
Spread the batter evenly into the prepared baking dish, smoothing the top with a spatula.
Step 7: Prepare the Fudge Layer
In a separate bowl, mix the remaining 1/4 cup cocoa powder, light brown sugar, and hot water. Stir until combined. Pour this fudge mixture over the batter in the baking dish—do not stir!
Step 8: Bake
Bake the cake in the preheated oven for 30-35 minutes, or until a toothpick inserted in the center comes out clean. The top layer will be set, while the fudge layer remains gooey underneath.
Step 9: Cool and Serve
Allow the cake to cool for a few minutes before serving. Scoop warm portions into bowls, top with vanilla ice cream, and drizzle with extra fudge sauce if desired.
Adaptations for Special Diets

If you or your guests have dietary restrictions, consider these adaptations:
- Gluten-Free: Substitute all-purpose flour with a gluten-free flour blend.
- Dairy-Free: Use almond milk or oat milk in place of whole milk and coconut oil instead of butter.
- Vegan: Replace the butter with a plant-based alternative and use a flax egg or applesauce instead of any eggs if used in adaptation.
- Reduced Sugar: Use a sugar substitute or reduce the amount of granulated sugar and brown sugar to taste.
Pro Perspective
Creating a perfect Hot Fudge Sundae Cake is all about timing. Make sure your ingredients are at room temperature before you begin mixing; this helps achieve a smoother batter. If you want a truly indulgent experience, consider adding a pinch of espresso powder to enhance the chocolate flavor. Don’t forget that the cake is best served warm, so if you have leftovers, reheat them in the microwave for a few seconds before serving.
Make Ahead Like a Pro
This Hot Fudge Sundae Cake can be made ahead of time for convenience. You can prepare the batter and fudge layer, pour them into the baking dish, cover, and refrigerate for up to a day. When you’re ready to serve, simply pop it in the oven and bake as directed. This way, you can spend more time enjoying your company and less time in the kitchen.
Quick Questions
Can I use dark chocolate instead of semi-sweet chocolate chips?
Absolutely! Dark chocolate will provide a richer flavor, but keep in mind that it may also make the cake slightly less sweet.
How do I store leftovers?
Store any leftover cake in an airtight container in the refrigerator for up to 3 days. Reheat individual pieces in the microwave for a warm treat.
Can I freeze Hot Fudge Sundae Cake?
Yes, this cake freezes wonderfully! Wrap individual slices in plastic wrap and store them in a freezer-safe bag for up to 2 months. Thaw in the refrigerator before reheating.
What ice cream pairs best with this cake?
Vanilla ice cream is a classic choice, but feel free to experiment with flavors like chocolate, caramel, or even mint chocolate chip for a fun twist!
If you’re inspired by this Hot Fudge Sundae Cake, consider trying these related recipes:
That’s a Wrap
This Hot Fudge Sundae Cake is not just a dessert; it’s an experience that will satisfy your sweet tooth and warm your heart. With its delectable layers and rich flavors, it’s a cake that’s sure to become a favorite among friends and family. The ease of preparation means you can whip it up for any occasion, and the delightful combination of cake and fudge will have everyone coming back for seconds. So gather your ingredients, roll up your sleeves, and get ready to indulge in a slice of chocolate heaven!

Hot Fudge Sundae Cake
Equipment
- Mixing Bowls
- Whisk
- 9x13 inch Baking Dish
- Measuring cups and spoons
- Spatula
- Oven
Ingredients
- 1 cup all-purpose flour The foundation of your cake, giving it structure and texture.
- 1/2 cup cocoa powder divided in half
- 1 cup granulated sugar Sweetness is essential, balancing the deep flavors of chocolate.
- 2 teaspoons baking powder helps the cake rise and become fluffy
- 1 cup whole milk Moisture is key; milk keeps the cake tender and adds richness.
- 2 tablespoons melted butter For a luscious texture and a hint of buttery flavor.
- 2 teaspoons vanilla extract An essential flavor that enhances the cake's sweetness.
- 1 cup semi-sweet chocolate chips These create pockets of melted chocolate throughout the cake.
- 1 cup packed light brown sugar For depth of flavor and a hint of caramel sweetness.
- 1 cup hot water This final addition helps create the gooey fudge layer beneath the cake.
Instructions
- Begin by preheating your oven to 350°F (175°C). This ensures the cake bakes evenly.
- Lightly grease a 9x13-inch baking dish with cooking spray or butter. This prevents the cake from sticking.
- In a mixing bowl, combine the all-purpose flour, 1/4 cup cocoa powder, granulated sugar, baking powder, and a pinch of salt. Whisk these together until well blended.
- Pour in the whole milk, melted butter, and vanilla extract. Mix until just combined, being careful not to overmix.
- Fold in the semi-sweet chocolate chips, ensuring they are evenly distributed throughout the batter.
- Spread the batter evenly into the prepared baking dish, smoothing the top with a spatula.
- In a separate bowl, mix the remaining 1/4 cup cocoa powder, light brown sugar, and hot water. Stir until combined. Pour this fudge mixture over the batter in the baking dish—do not stir!
- Bake the cake in the preheated oven for 30-35 minutes, or until a toothpick inserted in the center comes out clean. The top layer will be set, while the fudge layer remains gooey underneath.
- Allow the cake to cool for a few minutes before serving. Scoop warm portions into bowls, top with vanilla ice cream, and drizzle with extra fudge sauce if desired.
Notes
- For gluten-free version, substitute all-purpose flour with a gluten-free flour blend.
- Use almond or oat milk and coconut oil for a dairy-free adaptation.
- Prepare the batter and fudge layer ahead, refrigerate up to one day before baking.
- Store leftovers in an airtight container in the fridge for up to 3 days; reheat before serving.
- Freeze individual slices wrapped well for up to 2 months; thaw in fridge before reheating.
