Super Moist Homemade Chocolate Cake

Quick Overview

This ultimate chocolate fudge cake delivers an ultra-moist, tender crumb coated in a silky, rich chocolate frosting. It relies on everyday pantry staples to achieve a bakery-quality texture without complicated baking techniques or special equipment.

You can mix everything in one bowl using a simple hand whisk. The addition of warm milk and vegetable oil guarantees a cake that stays soft and fudgy for days.

Prep time: 15 minutes Cook time: 30 minutes Total time: 45 minutes Servings: 9 slices Estimated calories per serving: 380 kcal

Ingredients

For the Cake Batter

1.5 cups (180 g) all-purpose flour
1 cup (200 g) granulated white sugar
0.5 cup (45 g) unsweetened cocoa powder
1 tsp baking powder
0.5 tsp baking soda
0.5 tsp salt
1 large egg, room temperature
0.5 cup (120 ml) vegetable oil
0.5 cup (120 ml) warm water
0.5 cup (120 ml) warm milk
1 tsp vanilla extract

For the Chocolate Frosting

1 cup (175 g) milk or semi-sweet chocolate chips, melted
0.5 cup (120 g) sour cream or heavy cream, room temperature

How to Make Chocolate Fudge Cake

Preheat your oven to 350°F (175°C) and line an 8×8-inch square baking pan with parchment paper.
Sift the all-purpose flour, sugar, unsweetened cocoa powder, baking powder, baking soda, and salt into a large glass mixing bowl.
Whisk the dry ingredients together thoroughly until uniform in color.
Add the egg, vegetable oil, warm water, and vanilla extract directly into the dry mixture.
Whisk until a thick batter forms, then pour in the warm milk and whisk continuously until smooth and glossy.
Pour the batter evenly into your prepared baking pan, smoothing the top with a spatula.
Bake at 350°F (175°C) for 28 to 32 minutes until a toothpick inserted into the center comes out clean.
Remove the cake from the oven and let it cool completely on a wire rack.
Melt the chocolate chips in a heatproof bowl, then stir in the sour cream until rich and smooth.
Spread the chocolate frosting evenly over the cooled cake using an offset spatula before slicing into squares.

Pro Tip

Never spread frosting onto a warm cake. The cocoa butter in the frosting will melt immediately, causing the chocolate topping to run off the sides and soak unevenly into the crumb. Always allow the cake to cool to room temperature on a wire rack before applying your frosting.

Serving & Storage

Serve each slice at room temperature on a dessert plate. A scoop of vanilla bean ice cream or fresh raspberries balances the rich chocolate fudge flavor perfectly. You can also pair a warm slice with fresh espresso or cold milk.

Store leftovers in an airtight container at room temperature for up to 3 days. To keep it fresh longer, store the frosted cake in the refrigerator for up to 5 days.

If frozen unfrosted, wrap the cake slab tightly in plastic wrap and foil for up to 2 months. Thaw frozen cake overnight in the fridge and top with fresh frosting before serving. Reheat individual slices in the microwave for 8 seconds to restore heat and moisture.

FAQs

Can I replace the vegetable oil with butter? Yes, melted butter works well, but vegetable oil produces a noticeably softer crumb when serving cold.

Why is room-temperature sour cream necessary for the frosting? Cold cream causes melted chocolate to seize instantly, creating a lumpy texture instead of a silky finish.

How do I know when the cake is completely finished baking? A wooden toothpick inserted into the middle should come out clean or with a few moist crumbs attached.