I made the Easy Hot Fudge Cake and it collapses into a gloriously fudgy pool that makes everyone argue over the last bite.

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I have a ridiculous soft spot for my Grandma’s Hot Fudge Cake. I’m obsessed with that molten top and the way the cake feels like a Moist Chocolate Fudge Cake Recipe in a bowl.

I love that sneaky hit of granulated sugar and the smell of vanilla extract that makes the batter sing. It isn’t pretty, it’s savage chocolate comfort, gooey and dark and messy.

And when I dig my spoon in, I’m selfish about it. Pure chocolate pleasure, no shame.

People expect fancy desserts but give me this Hot Fudge Cake every time. I crave it daily, zero apologies.

Ingredients

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Basically the cake body.
Gives structure and tender, slightly cakey crumb.
It sweetens everything.
Pure simple sugar rush and caramel notes.
Chocolate boost.
Adds deep cocoa bitterness and color to the batter.
Light lift.
Makes the cake springy and not dense.
Just a pinch of salt.
Balances sweetness and brightens chocolate.
Milk keeps it soft and moist; makes batter smooth.
Vegetable oil keeps cake tender and stays moist for days.
Vanilla adds warmth and rounds out the chocolate edge.
Brown sugar for the sauce.
Caramel-y, sticky, and deeply sweet.
Boiling water melts cocoa into a glossy, saucy finish.
Plus a pinch of espresso powder.
Deepens chocolate without tasting like coffee.

Ingredient Quantities

1 cup (125 g) all purpose flour

1 cup (200 g) granulated sugar

2 tablespoons unsweetened cocoa powder, plus 2 tablespoons for the topping

1 teaspoon baking powder

1/4 teaspoon salt

1/2 cup (120 ml) whole milk

1/3 cup (80 ml) vegetable oil

1 teaspoon vanilla extract

3/4 cup (150 g) packed light brown sugar for the sauce

1 1/4 to 1 1/2 cups (300 to 360 ml) boiling water

Optional: pinch of instant espresso powder to deepen the chocolate flavor

How to Make this

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1. Preheat oven to 350F (175C) and lightly grease an 8-inch square baking pan, or line it with parchment for easier serving.

2. In a medium bowl whisk together 1 cup (125 g) all purpose flour, 1 cup (200 g) granulated sugar, 2 tablespoons unsweetened cocoa powder, 1 teaspoon baking powder and 1/4 teaspoon salt. If using the optional espresso powder add a pinch now to deepen the chocolate flavor.

3. In another bowl stir 1/2 cup (120 ml) whole milk, 1/3 cup (80 ml) vegetable oil and 1 teaspoon vanilla extract until combined.

4. Pour the wet ingredients into the dry and stir just until no big streaks of flour remain. Batter will be fairly thick, that is normal.

5. Spread the batter evenly into the prepared pan, smoothing the top with a spatula or back of a spoon.

6. Sprinkle 3/4 cup (150 g) packed light brown sugar evenly over the batter, then dust 2 tablespoons unsweetened cocoa powder on top of the brown sugar.

7. Carefully pour 1 1/4 to 1 1/2 cups (300 to 360 ml) boiling water over the back of a spoon held just above the surface of the pan so the water distributes gently and doesn’t wash the toppings away. Youll see the batter sink a bit and that is how the hot fudge sauce forms.

8. Bake for 35 to 40 minutes until the center is set and the edges are bubbling. A toothpick inserted into the center will come out mostly clean with a few moist crumbs, not raw batter.

9. Remove from oven and let rest for about 10 minutes so the sauce thickens a little. Serve warm, spooning the hot fudge sauce over each piece; great with vanilla ice cream.

10. Store leftovers covered in the fridge for up to 3 days, reheat gently in the microwave before serving.

Equipment Needed

1. 8-inch square baking pan (or same-size pan plus parchment paper)
2. Parchment paper or nonstick spray
3. 2 medium mixing bowls
4. Dry measuring cups and spoons (for flour, cocoa, baking powder, salt, sugar)
5. Liquid measuring cup (for milk, oil, boiling water)
6. Whisk
7. Rubber spatula or spoon for spreading batter
8. Large spoon for gently pouring boiling water over the topping
9. Oven mitts and a toothpick or cake tester for checking doneness

FAQ

Q: What size pan should I use and how long do I bake it? A: Use an 8×8 inch square pan or similar 2 quart dish. Bake at 350°F (175°C) about 25 to 30 minutes until the top looks set and a toothpick comes out with a few moist crumbs. Dont overbake, the cake needs to stay tender so the sauce can soak in.

Q: Can I make this ahead of time? A: You can mix the dry and wet parts separately and keep them covered in the fridge a day ahead. But for best gooey texture serve soon after pouring the boiling water and letting it rest 10 minutes. If you make it fully ahead, reheat gently in the oven to bring back some warmth before serving.

Q: What can I substitute for whole milk or vegetable oil? A: You can use 2% or skim milk if thats what you have, but whole milk gives richer sauce. For oil try light olive oil or melted coconut oil, same amount. Butter will change texture a bit but a 1:1 swap of melted butter works in a pinch.

Q: My sauce is too thin or too thick, how do I fix it? A: If sauce is too thin let cake stand a few extra minutes, it usually thickens as it cools. If it stays thin, sprinkle a little more cocoa mixed with sugar over the top and pour hot water; that will thicken. If too thick add a splash more hot water and stir gently.

Q: Can I add instant espresso powder or use different cocoa? A: Yes, a pinch of instant espresso deepens the chocolate flavor without tasting like coffee. Use Dutch-processed or natural cocoa, but note Dutch cocoa is milder so you might want a tiny extra pinch of espresso or a bit more cocoa for same punch.

Q: How should I serve Grandma's Hot Fudge Cake? A: Spoon warm cake into bowls, making sure to get lots of that saucy liquid. Top with vanilla ice cream or whipped cream and a sprinkle of flaky salt if you like sweet and salty. It also goes great with fresh berries for a little brightness.

Grandma’s Hot Fudge Cake Recipe Substitutions and Variations

All purpose flour: swap 1:1 with a gluten free 1-to-1 baking blend (make sure it contains xanthan gum). If your blend has no gum add 1/4 tsp xanthan for this small cake or it may be crumbly.
Granulated sugar: replace with 7/8 cup (175 g) coconut sugar for a deeper, slightly caramel note. Texture is almost the same, but color will be darker.
Whole milk: use 1/2 cup buttermilk plus 0 or 1/4 cup water to reach 1/2 cup total liquid. Buttermilk gives a tang and a bit more rise; if using plant milk use unsweetened soy or oat for best texture.
Vegetable oil: sub with equal amount melted butter (1/3 cup) for richer flavor. If using, cool butter slightly before mixing so it doesn’t cook the eggs or scorch the batter.

Pro Tips

1) Warm the milk a little before adding it to the batter. It helps the cocoa bloom and the batter mixes smoother. Don’t make it hot though, just warm to touch or about body temp.

2) Press the brown sugar down lightly after sprinkling it on top so it makes better contact with the batter. If you just dump it on it can float in clumps and the sauce won’t be even.

3) Pour the boiling water very slowly, using the back of a spoon or pour it down the side of the pan. If you pour too fast the batter will wash away and you’ll get thin spots. Start with 1 1/4 cups, check consistency, then add up to the extra 1/4 cup if it looks too thick.

4) Let it rest at least 10 minutes before serving, longer if you want thicker sauce. It looks like nothing’s happening right out of the oven but the sauce firms up as it cools. Reheat gently if you store leftovers or the sauce gets too solid.

Grandma's Hot Fudge Cake Recipe

Recipe by Tina Bueller

0.0 from 0 votes

I made the Easy Hot Fudge Cake and it collapses into a gloriously fudgy pool that makes everyone argue over the last bite.

Servings

servings

Calories

321

kcal

Equipment: 1. 8-inch square baking pan (or same-size pan plus parchment paper)
2. Parchment paper or nonstick spray
3. 2 medium mixing bowls
4. Dry measuring cups and spoons (for flour, cocoa, baking powder, salt, sugar)
5. Liquid measuring cup (for milk, oil, boiling water)
6. Whisk
7. Rubber spatula or spoon for spreading batter
8. Large spoon for gently pouring boiling water over the topping
9. Oven mitts and a toothpick or cake tester for checking doneness

Ingredients

1 cup (125 g) all purpose flour
1 cup (200 g) granulated sugar
2 tablespoons unsweetened cocoa powder, plus 2 tablespoons for the topping
1 teaspoon baking powder
1/4 teaspoon salt
1/2 cup (120 ml) whole milk
1/3 cup (80 ml) vegetable oil
1 teaspoon vanilla extract
3/4 cup (150 g) packed light brown sugar for the sauce
1 1/4 to 1 1/2 cups (300 to 360 ml) boiling water
Optional: pinch of instant espresso powder to deepen the chocolate flavor

Directions

Preheat oven to 350F (175C) and lightly grease an 8-inch square baking pan, or line it with parchment for easier serving.
In a medium bowl whisk together 1 cup (125 g) all purpose flour, 1 cup (200 g) granulated sugar, 2 tablespoons unsweetened cocoa powder, 1 teaspoon baking powder and 1/4 teaspoon salt. If using the optional espresso powder add a pinch now to deepen the chocolate flavor.
In another bowl stir 1/2 cup (120 ml) whole milk, 1/3 cup (80 ml) vegetable oil and 1 teaspoon vanilla extract until combined.
Pour the wet ingredients into the dry and stir just until no big streaks of flour remain. Batter will be fairly thick, that is normal.
Spread the batter evenly into the prepared pan, smoothing the top with a spatula or back of a spoon.
Sprinkle 3/4 cup (150 g) packed light brown sugar evenly over the batter, then dust 2 tablespoons unsweetened cocoa powder on top of the brown sugar.
Carefully pour 1 1/4 to 1 1/2 cups (300 to 360 ml) boiling water over the back of a spoon held just above the surface of the pan so the water distributes gently and doesn't wash the toppings away. Youll see the batter sink a bit and that is how the hot fudge sauce forms.
Bake for 35 to 40 minutes until the center is set and the edges are bubbling. A toothpick inserted into the center will come out mostly clean with a few moist crumbs, not raw batter.
Remove from oven and let rest for about 10 minutes so the sauce thickens a little. Serve warm, spooning the hot fudge sauce over each piece; great with vanilla ice cream.
Store leftovers covered in the fridge for up to 3 days, reheat gently in the microwave before serving.

Notes

Below you’ll find my best estimate of this recipe’s nutrition facts. Treat the numbers as a guide rather than a rule—great food should nourish both body and spirit. Figures are approximate, and the website owner assumes no liability for any inaccuracies in this recipe.