Vanilla Sheet Cake with Whipped Buttercream Frosting

I make Vanilla Sheet Cake with Whipped Buttercream Frosting when I want a recipe that feels familiar but still asks me to pay attention. The ingredient list is straightforward, yet the small details matter: measured bowls, the right pan, and a little patience while it cools or rests.

This version keeps the original timing intact: 20 min prep, 30 min cook time. It serves 12, and I use that number when I portion it.

I wrote the method the way I move through the kitchen. I set out the ingredients first, watch for visual cues, and avoid rushing the final cooling step.

Why I keep coming back to this

• The timing is predictable: 20 minutes of prep and 30 minutes of cooking gives me a clear plan.
• The serving count stays at 12, so I know whether I am feeding a table or saving leftovers.
• The main heat cue is 350°F (177°C), which I write on a note before I start.
• The pan cue is 9×13-inch, and I do not swap it unless I can adjust the timing.
• The recipe rewards measured ingredients more than fancy equipment.
• Leftovers hold up better when I cool them before covering.

What you need and why it matters

I measure everything into small bowls and group finishing ingredients separately. That simple habit keeps the last few minutes calm.

• Cake flour, 3 cups.It gives the recipe its structure; I spoon it into the cup rather than scooping to avoid packing.
• Granulated sugar, 1 1/2 cups.
• Baking powder, 1 teaspoon.
• Baking soda, 1/2 teaspoon.
• Salt, 1/2 teaspoon.
• Unsalted butter, softened, 1 cup.
• Pure vanilla extract, 1 Tablespoon.
• Whole milk, 1 cup.It adds moisture and a subtle richness that water cannot replace.
• Sour cream, 1/3 cup.
• Eggs, at room temperature, 3 large.
• Unsalted butter, softened, 1 cup.
• Confectioners’ sugar, 4 1/2 cups.
• Heavy cream, 1/3 cup.
• Pure vanilla extract, 2 teaspoons.
• Salt, to taste.
• Optional: sprinkles for garnish.

How I make it

Step 1 — I preheat the oven to 350

I preheat the oven to 350°F (177°C). Generously grease a 9×13-inch cake pan.

Step 2 — Mix the base

I sift the cake flour, sugar, baking powder, baking soda, and salt in the bowl of a stand mixer. (Or if using a handheld mixer, any large mixing bowl.) With the paddle attachment, beat the ingredients together on low speed for a few seconds to gently combine. Add the butter, vanilla, and 1/2 cup of milk. Mix on medium speed until the dry ingredients are moistened, about 1 minute. Stop the mixer and scrape down the sides and up the bottom of the bowl. The mixture will resemble a thick dough.

Step 3 — I whisk the remaining milk,

I whisk the remaining milk, the sour cream, and eggs together in a medium bowl. With the mixer running on medium speed, add the egg mixture in 3 additions, mixing for about 15 seconds after each addition. Stop the mixer and scrape down the sides and up the bottom of the bowl, then mix for about 15 more seconds until batter is completely combined. Avoid over-mixing. Some small lumps are OK.

Step 4 — I pour and spread batter evenly

I pour and spread batter evenly into prepared pan. Bake for around 32-35 minutes or until the cake is baked through. To test for doneness, insert a toothpick into the center of the cake. If it comes out clean, it’s done. Allow cake to cool completely in the pan set on a wire rack. The cake must be completely cool before frosting.

Step 5 — Mix the base

With a handheld or stand mixer fitted with a paddle attachment, beat the butter on medium speed until creamy, about 2 minutes. Add confectioners’ sugar, heavy cream, and vanilla extract. Beat on low speed for 30 seconds, then increase to medium-high speed and beat for 4 full minutes. Add up to 1/4 cup more confectioners’ sugar if frosting is too thin or another Tablespoon of cream if frosting is too thick. Add a pinch of salt if frosting is too sweet. (I add 1/8 teaspoon salt.) Frosting should be extra fluffy.

Step 6 — I spread frosting in a thick

I spread frosting in a thick layer on cooled cake. I use and recommend an offset spatula. If desired, use a piping tip to pipe some frosting and/or garnish with sprinkles. Slice and serve.

Step 7 — I cover leftover cake tightly

I cover leftover cake tightly and store in the refrigerator for up to 5 days.

Tips from my kitchen

• Measure first.I set every ingredient on the counter before heating the oven or stove.
• Watch the heat.I trust the visual cue over the clock when my pan or oven runs different.
• Cool before covering.Steam softens crisp edges and can
• Keep tools simple.A bowl, spatula, whisk, and small offset spatula handle most of the work.

Variations I have actually tried

• Variation 1:I add orange zest when I want a brighter finish.
• Variation 2:I make the cake layers one day ahead and assemble them after a full chill.
• Variation 3:I use coffee instead of water in chocolate batters for a deeper note.
• Variation 4:I switch the garnish to toasted nuts when berries are not good.
• Variation 5:I turn leftover slices into tidy trifle cups.

How I serve it

I serve Vanilla Sheet Cake with Whipped Buttercream Frosting after it has had enough time to settle. For sweets, I like clean slices or tidy pieces with coffee, tea, or cold milk. For savory dishes, I add something crisp, bright, or fresh on the side.

If I am taking it somewhere, I keep garnishes separate until the last minute. That small move keeps crumbs crisp, frosting cleaner, sauces brighter, and toppings from sliding around.

Storing and reheating

I cool leftovers completely, then cover them tightly.

For reheating, I use gentle heat. A short microwave burst works for single portions, while a low oven brings back better texture for pieces with a crust, crumb, or crunchy topping.

Frequently asked questions

Can I make Vanilla Sheet Cake with Whipped Buttercream Frosting ahead?

I often do part of the work ahead, then finish close to serving so the texture stays fresh.

Can I change the pan size?

I try to use 9×13-inch. If I change it, I watch thickness and start checking early.

How do I know it is done?

I use the source time as a guide, then check color, set edges, and the cue at 350°F (177°C).

Can I freeze leftovers?

I freeze sturdy portions after they cool completely, wrapped tightly and labeled with the date.

What mistake should I avoid?

I do not rush the cooling or resting step. Warm layers, crumbs, or fillings can shift if handled too soon.

If you make Vanilla Sheet Cake with Whipped Buttercream Frosting, I would love to hear what variation or garnish you used.

Vanilla Sheet Cake with Whipped Buttercream Frosting

Prep Time 20 mins Cook Time 30 mins Total Time 50 mins Difficulty: Medium Servings: 12 Calories: 386 kcal Dietary:

E eggs

Print Recipe

Pin Recipe

0 Add to Favorites

Cuisine: American Courses: Cake Recipe Keys: Nut Free Vegetarian Meals

Description

I make Vanilla Sheet Cake with Whipped Buttercream Frosting with the original prep time of 20 min and cook time of 30 min. The steps below keep the source quantities, pan cues, temperatures, and serving count intact while adding my practical kitchen notes.

Ingredients You’ll Need

Scale

1/2x 1x 2x 3x

• 3 cups cake flour (354g)

• 1 ¹⁄₂ cups granulated sugar (300g)

• 1 teaspoon baking powder

• ¹⁄₂ teaspoon baking soda

• ¹⁄₂ teaspoon salt

• 1 cup unsalted butter, softened (16 Tbsp; 226g)

• 1 Tablespoon pure vanilla extract

• 1 cup whole milk (240ml)

• ¹⁄₃ cup sour cream (80g)

• 3 large eggs, at room temperature

• 4 ¹⁄₂ cups confectioners' sugar (540g)

• ¹⁄₃ cup heavy cream (80ml)

• salt, to taste

• optional: sprinkles for garnish

Instructions

1. I preheat the oven to 350°F (177°C). Generously grease a 9x13-inch cake pan.
   Mark as complete
2. I sift the cake flour, sugar, baking powder, baking soda, and salt in the bowl of a stand mixer. (Or if using a handheld mixer, any large mixing bowl.) With the paddle attachment, beat the ingredients together on low speed for a few seconds to gently combine. Add the butter, vanilla, and 1/2 cup of milk. Mix on medium speed until the dry ingredients are moistened, about 1 minute. Stop the mixer and scrape down the sides and up the bottom of the bowl. The mixture will resemble a thick dough.
   Mark as complete
3. I whisk the remaining milk, the sour cream, and eggs together in a medium bowl. With the mixer running on medium speed, add the egg mixture in 3 additions, mixing for about 15 seconds after each addition. Stop the mixer and scrape down the sides and up the bottom of the bowl, then mix for about 15 more seconds until batter is completely combined. Avoid over-mixing. Some small lumps are OK.
   Mark as complete
4. I pour and spread batter evenly into prepared pan. Bake for around 32-35 minutes or until the cake is baked through. To test for doneness, insert a toothpick into the center of the cake. If it comes out clean, it's done. Allow cake to cool completely in the pan set on a wire rack. The cake must be completely cool before frosting.
   Mark as complete
5. With a handheld or stand mixer fitted with a paddle attachment, beat the butter on medium speed until creamy, about 2 minutes. Add confectioners' sugar, heavy cream, and vanilla extract. Beat on low speed for 30 seconds, then increase to medium-high speed and beat for 4 full minutes. Add up to 1/4 cup more confectioners' sugar if frosting is too thin or another Tablespoon of cream if frosting is too thick. Add a pinch of salt if frosting is too sweet. (I add 1/8 teaspoon salt.) Frosting should be extra fluffy.
   Mark as complete
6. I spread frosting in a thick layer on cooled cake. I use and recommend an offset spatula. If desired, use a piping tip to pipe some frosting and/or garnish with sprinkles. Slice and serve.
   Mark as complete
7. I cover leftover cake tightly and store in the refrigerator for up to 5 days.
   Mark as complete

Nutrition Facts

Servings 12

---

Amount Per Serving

Calories 386kcal

% Daily Value *

Total Fat 20g31%

Saturated Fat 12g60%

Trans Fat 0.8g

Cholesterol 54mg18%

Sodium 199mg9%

Potassium 72mg3%

Total Carbohydrate 49g17%

Dietary Fiber 1g4%

Sugars 27g

Protein 3g6%

---

Calcium 66 mg

Iron 1.3 mg

* Percent Daily Values are based on a 2,000 calorie diet. Your daily value may be higher or lower depending on your calorie needs.

Note

Measure before heating. I set every ingredient for Vanilla Sheet Cake with Whipped Buttercream Frosting on the counter before I turn on the oven or stove.

Use the listed pan. A different size changes thickness, browning, and timing.

Cool with patience. Warm filling, frosting, or crumbs can shift if I cut too soon.

Season or garnish at the end. I taste and adjust once the main texture is set.

Keywords: vanilla sheet cake with whipped buttercream frosting, homemade recipe, cake flour, granulated sugar, baking powder, baking soda, salt, unsalted butter, softened, pure vanilla extract