Ever thought about why this cake stays so moist, even days later?
It’s not just sugar and butter—there’s a little science trick that helps it stay tender and almost fudgy, even after sitting on your counter for a while. I found this out totally by accident. One time, I left a slice out overnight because I was too tired to put it away. Still soft. Still rich. The next day, I realized it was somehow better—like the flavors had mellowed and deepened. Turns out, there’s a simple ingredient that traps moisture in a way I never paid attention to before, and it’s kind of sneaky how effective it is.
This cake feels especially relevant right now. Everything’s so fast, so trendy—this old classic? It’s got a quiet, unpretentious presence that fits the chaos of modern life. Plus, it’s cut into squares, easy to hold, bitterly nostalgic without trying too hard. No fuss, no fuss, just good, honest cake.
- 1 1/2 cups all-purpose flour
- 1 cup granulated sugar
- 1/2 cup unsweetened cocoa powder unsweetened cocoa powder
- 1 teaspoon baking powder baking powder
- 1/2 teaspoon salt salt
- 1/2 cup vegetable oil vegetable oil
- 2 large eggs eggs
- 1 teaspoon vanilla extract vanilla extract
- 3/4 cup buttermilk buttermilk traps moisture for tenderness
- Optional chocolate chips or chunks for added richness
Mixing bowls
Whisk
Baking Dish
Oven
Cooling rack
Preheat the oven to 350°F (175°C). Lightly grease a baking dish and set aside.
In a large mixing bowl, whisk together the flour, cocoa powder, sugar, baking powder, and salt until evenly combined. The mixture should look uniform and slightly powdery.
1 1/2 cups all-purpose flour, 1 cup granulated sugar, 1/2 cup unsweetened cocoa powder unsweetened cocoa powder, 1 teaspoon baking powder baking powder, 1/2 teaspoon salt salt
In a separate bowl, whisk together the eggs, vegetable oil, vanilla extract, and buttermilk until smooth and slightly frothy. The mixture should appear well combined with no streaks of eggs.
2 large eggs eggs, 1/2 cup vegetable oil vegetable oil, 1 teaspoon vanilla extract vanilla extract, 3/4 cup buttermilk buttermilk
Pour the wet mixture into the bowl of dry ingredients. Using a spatula or whisk, gently fold them together until just combined; do not overmix. The batter will be thick and smooth.
1/2 cup vegetable oil vegetable oil, 2 large eggs eggs, 1 teaspoon vanilla extract vanilla extract, 3/4 cup buttermilk buttermilk
If using chocolate chips, fold them into the batter now. Transfer the batter into the prepared baking dish, spreading evenly with a spatula.
Optional chocolate chips or chunks
Bake in the preheated oven for about 35 minutes, or until the top is set and feels slightly firm to the touch. A toothpick inserted into the center should come out with moist crumbs but no wet batter.
Remove the cake from the oven and place on a cooling rack. Allow to cool for at least 20 minutes before slicing. The surface should have a slight sheen and the edges slightly pull away from the sides of the dish.
Sometimes I think it’s these little unexpected details that keep us coming back. The way it’s dense without being heavy, the smell of cocoa and vanilla hitting you as soon as you open the pan. Maybe it’s the perfect thing to make on a whim, knowing it’ll still be good tomorrow—and probably better. Funny how a cake can be so simple but hold so many memories, right? Anyway, I’ll stop rambling. Just keep a close eye on that oven. Because once it’s out—yeah, it’s hard to resist slicing into it.