
French butter cake is the kind of treat I bake when I want something deeply comforting with a special touch. The crumb is impossibly tender thanks to plenty of butter and sour cream and it brings back memories of rainy afternoons in my grandmother’s kitchen. Dusting the top with sugar creates the most beautiful crisp layer you will not want to miss.
This was my go-to bake when I first started hosting brunches since it never failed to impress yet was nearly foolproof. Friends always want the recipe after their first slice.
Ingredients
- Granulated sugar: Gives the cake its classic sweetness and also creates that crisp sweet topping. Check your sugar is fresh and clump-free for best results.
- Unsalted butter: Provides rich flavor and ensures the cake stays super moist. Fresh high-quality butter really makes a difference here.
- Eggs: Bind everything together and help the cake rise for a tender crumb. Using room temperature eggs will help them incorporate more evenly.
- Vanilla extract: Infuses the cake with warmth and aroma. I love using pure vanilla for the deepest flavor.
- Cake flour: Guarantees a delicate light crumb. Sift your flour to keep things airy.
- Baking powder: Helps the cake rise and stay fluffy. Always check your baking powder is fresh for best results.
- Salt: Sharpens the flavors and balances the sweetness. Use fine sea salt for even seasoning.
- Sour cream: Adds tang and wonderful moisture. Opt for full-fat sour cream for a truly tender cake.
- Extra sugar for topping: Creates that signature crackly sugar crust. Don’t skip this step.
Step-by-Step Instructions
- Prepare the Pan:
- Set your oven to 350 degrees Fahrenheit or 175 degrees Celsius and grease a 9 by 9 inch baking dish so your cake releases easily when ready.
- Cream the Sugar and Butter:
- In a large mixing bowl, whisk together granulated sugar and melted butter for about one minute until the mixture is light and looks a little fluffy. This makes your cake extra tender.
- Incorporate Eggs and Vanilla:
- Add the eggs one at a time, mixing thoroughly after each one, then stir in the vanilla extract so everything is evenly incorporated.
- Sift Dry Ingredients:
- In a separate bowl, sift together cake flour, baking powder, and salt. This step breaks up clumps and guarantees a fine, smooth crumb.
- Combine Wet and Dry:
- Gradually add your sifted dry mix into the wet ingredients using gentle strokes and mixing just until combined. You do not want to over-mix.
- Fold in the Sour Cream:
- Carefully fold the sour cream into the batter until everything just comes together. This is what keeps the cake soft and rich.
- Assemble and Top with Sugar:
- Pour the batter into your greased pan and use a spatula to smooth the top, then sprinkle the remaining sugar evenly over the batter.
- Bake:
- Place the cake in your preheated oven and bake for 30 to 35 minutes until a toothpick inserted in the center comes out clean and the sugar topping is golden.
- Cool and Serve:
- Let the cake cool in the pan for at least 15 minutes so it is easy to slice and serve.

The smell of vanilla and rich melted butter instantly brings me back to my childhood. My grandmother would often sneak me a little extra slice warm from the oven. Those moments made me truly believe baking was a kind of magic.
Storage Tips
Let your cake cool completely before wrapping to keep the sugar crust crisp and prevent soggy spots. Store at room temperature for two days or in the fridge for up to five days. For longer keeping, freeze individual slices and let them come to room temp before enjoying. I find wrapping slices in parchment keeps them freshest.
Ingredient Substitutions
If you do not have cake flour, you can use all-purpose flour but swap out two tablespoons per cup for cornstarch to mimic the fine texture of cake flour. Greek yogurt stands in well for sour cream in a pinch, and if you love citrus, a bit of lemon zest whisked into the sugar brightens things up beautifully.
Serving Suggestions
This cake is just as lovely with an afternoon cup of tea or dressed up for dessert with a dollop of lightly whipped cream and some fresh berries. For breakfast, a slice alongside strong coffee is a little bit of heaven. Sometimes I dust a bit of powdered sugar over the top just before serving for an extra elegant touch.

Making this cake is an instant ticket to feeling a little cozier no matter the season, and I sometimes sneak a warm slice with tea after everyone else has wandered off. The magic really comes down to the simple ritual of good butter, good vanilla, and a little patience while it bakes. Give it a try and soon it will become part of your own traditions too.
Frequently Asked Questions
- → What type of butter works best?
Unsalted butter provides a pure, creamy flavor and lets you control the salt level in the cake.
- → Why use cake flour instead of all-purpose?
Cake flour yields a lighter, finer crumb, giving the cake its signature tenderness and softness.
- → Is sour cream essential for texture?
Sour cream adds moisture, enhances richness, and helps produce a soft, melt-in-your-mouth crumb.
- → Can this cake be made in advance?
Absolutely. Bake a day ahead and store covered; the cake stays tender and flavors deepen overnight.
- → How should leftovers be stored?
Keep covered at room temperature for up to two days, or refrigerate for extended freshness.