1kg Butter Cake Recipe: Ultra-Rich Moisture With Vanilla Frosting Rivers

This 1kg butter cake recipe delivers the kind of ultra-moist, tender crumb that disappears in your first bite—no dry crumb here. 💛 The secret lies in precise ingredient ratios and gentle folding that creates that signature velvety texture. I've perfected this over years of baking, ensuring every slice stays moist for days, especially when paired with that signature vanilla frosting. What sets this recipe apart is the foolproof technique that guarantees a perfect rise and even bake every time. With imperial measurements and clear instructions, you'll achieve a rich, golden dome that's as impressive to look at as it is to eat. The cake's buttery depth comes from high-fat butter (not margarine), while the vanilla frosting adds rivers of sweetness that cut through the richness. By the time you pull it from the oven, you'll have a 12-serving masterpiece with a tender crumb that's moist for days—no drying out, no crumbling. The frosting isn't just decoration; it's a flavor layer that makes every bite feel special. This is the kind of cake that makes gatherings memorable. Whether you're baking for a celebration or treating yourself, this recipe delivers restaurant-quality results at home. Let's get started on creating your perfect butter cake.

Ingredients for 1kg butter cake

Twelve ingredients, twelve perfect slices of ultra-moist butter cake magic.

The butter here isn't just any butter—European-style with 82% fat content is non-negotiable for that signature richness. Plugrá or Kerrygold are my go-tos, but any high-fat butter works. Room temperature is key—press it into a bowl and let it soften for 2 hours. The vanilla? Bourbon-infused extract plus vanilla bean paste gives that professional bakery depth. Don't skimp on the vanilla—this is where the magic happens. For the frosting, powdered sugar should be sifted through a fine mesh to avoid lumps, and Domino brand is my secret weapon for smoothness.

No European butter? Land O'Lakes unsalted is a solid backup, but expect slightly less richness. Short on vanilla? Double the extract or use 1 vanilla bean scraped. The frosting can be made with whipped cream instead of heavy cream if you prefer lighter texture, but the heavy cream gives that classic buttercream body. For the eggs, room temperature is critical—cold eggs can cause the batter to curdle. If you're baking at high altitude, reduce the baking powder by 0.25 tsp to prevent over-rising. The frosting stabilizer is optional but recommended if you're piping decorations.

Butter and eggs should be stored in the fridge until ready to use—2 days max for the batter once mixed. The frosting keeps for 3 days in an airtight container, but it's best used within 24 hours for peak texture. Cake layers can be wrapped individually in plastic and frozen for up to 3 months—thaw overnight in the fridge before frosting. For extra moisture, brush warm cake layers with simple syrup (equal parts sugar and water, heated) before frosting. This recipe makes enough frosting for generous rivers—save the extras for cupcakes or cookies.

Step-by-step instructions for ultra-rich vanilla butter cake

Here's how to create a cake so moist it practically oozes flavor with every slice.

In a stand mixer fitted with the paddle attachment, beat the 12 oz unsalted butter and 2.5 cups granulated sugar on medium speed for 4-5 minutes until light and fluffy. You're looking for a texture that nearly doubles in volume and becomes pale in color—this incorporates air that creates that signature tender crumb.

Here's the thing—I always let my butter come to room temperature first (about 1 hour out of the fridge). Press it gently; it should leave a slight indent but hold its shape. Cold butter creates dense cakes, while room-temperature butter gives you that melt-in-your-mouth texture we're after.

Add the 6 whole large eggs one at a time, mixing on low speed for 30 seconds after each addition until fully incorporated. Then stir in the 2 tbsp pure vanilla extract and 1 tbsp vanilla bean paste until completely combined. The vanilla bean paste adds that extra depth of flavor that separates this from ordinary vanilla cakes.

I like to separate the eggs first, then add the yolks first followed by the whites. This helps prevent overmixing which can develop gluten and make the cake tough. The mixture should be smooth and slightly thickened—if it looks too thin, we'll fix that in the next step.

In a separate bowl, whisk together the 3.5 cups all-purpose flour, 2 tsp baking powder, and 0.5 tsp salt. Sift the flour mixture directly into the butter mixture in three additions, mixing on low speed just until combined after each addition. Overmixing here is the enemy—you should still see some flour streaks when you're done.

This is where the magic happens for that ultra-moist texture. The gentle folding keeps the cake tender rather than dense. I use a spatula to scrape down the sides of the bowl between additions to ensure everything gets properly incorporated without developing gluten.

Divide the batter evenly between two 9-inch round cake pans lined with parchment paper. Bake in a preheated 350°F oven for 25-30 minutes, or until a toothpick inserted in the center comes out clean. The edges should be golden brown while the center remains slightly springy to the touch.

I always rotate the pans halfway through baking for even heat distribution. The cake is done when the top springs back when gently pressed and the internal temperature reaches 210°F. Let the cakes cool in the pans for 10 minutes before transferring to a wire rack to cool completely.

In a separate bowl, beat the 1 cup cold heavy cream until it begins to thicken. Gradually add the 4 cups powdered sugar and 1 tsp vanilla frosting stabilizer, mixing on high speed for 3-4 minutes until smooth and fluffy. The stabilizer helps prevent the frosting from becoming too runny as it warms.

Spread the frosting between the cooled cake layers and over the top and sides. For that signature "frosting rivers" effect, pipe additional frosting in swirls down the sides using a piping bag with a star tip. Chill the cake for 30 minutes before serving to let the frosting set slightly.

Essential equipment for this dish

Stand Mixer Essentials

Your stand mixer is the workhorse of this recipe—no hand-whipping here! I swear by the KitchenAid Artisan Series with the paddle attachment for creaming butter and sugar. The 5-quart bowl gives you room to work without spills, and the variable speed control lets you fine-tune from delicate egg incorporation to high-speed frosting. For budget-friendly options, the Cuisinart Smart Mixer handles this recipe beautifully too. 🔥

Precision Baking Pans

Invest in two 9-inch round cake pans with 2-inch high sides—they're perfect for this recipe's volume. I use Wilton Perfect Results Non-Stick pans because they release cakes effortlessly and create that golden dome we want. For even baking, choose pans with heavy-gauge aluminum construction. Line the bottoms with parchment paper to prevent sticking and ensure clean slices. Pro tip: Use the same brand for both pans to ensure even baking.

Mixing Tools Matter

A flexible silicone spatula is your best friend for scraping down bowl sides and folding dry ingredients. I recommend the OXO Good Grips Silicone Spatula—it's heat-resistant and won't scratch your mixer bowl. For measuring, grab a stainless steel liquid measuring cup (like Pyrex Precision) and a set of measuring spoons with clearly marked 1/8 tsp increments. A fine-mesh sieve is essential for sifting flour and powdered sugar to avoid lumps in your frosting.

Temperature Control

An oven thermometer is non-negotiable—I use the Thermoworks Oven Thermometer to ensure your oven hits exactly 350°F. Many home ovens run 25-50°F hotter than set, which can dry out your cake. For cooling, a wire cooling rack is better than a plate—it allows air circulation to prevent a soggy bottom. I also keep a digital instant-read thermometer (like Thermapen) handy to check internal temperature at 210°F for perfect doneness.

Frosting Finishing Touches

For those signature frosting rivers, you'll need a piping bag with a star tip (I use Wilton 1M tip) and a small offset spatula for spreading. A bench scraper helps create clean edges when leveling frosting. For presentation, grab a turntable (like Wilton Cake Stand) to showcase your masterpiece. Don't forget a sharp serrated knife for clean cake slices—Japanese pull knives like Global GX are my favorite for this job.

Frequently asked questions