If you’re looking for a cake that’s both simple to prepare and absolutely delightful to eat, the Doctored Cake Mix White Sheet Cake is your answer. This cake is perfect for any occasion, whether it’s a birthday party, a family gathering, or just because you deserve a sweet treat. The best part? It starts with a box of cake mix and elevates it to something truly special with a few additional ingredients. Let’s dive into why this cake should be your go-to recipe and how to make it.
Top Reasons to Make Doctored Cake Mix White Sheet Cake

- Ease of Preparation: Using a cake mix saves time while still delivering a delicious cake.
- Customizable: Feel free to add your favorite flavors or toppings, making it uniquely yours.
- Perfect for Feeding a Crowd: The sheet cake format is ideal for parties, serving many people with minimal effort.
- Moist and Flavorful: The additional ingredients ensure a rich flavor and moist texture that rivals homemade cakes.
- Quick Baking Time: This cake comes together quickly, so you won’t be spending all day in the kitchen.
What Goes Into Doctored Cake Mix White Sheet Cake
- 1 (15.25-ounce) box white cake mix: The base of your cake, providing sweetness and structure.
- 1 cup all-purpose flour: This adds density and helps create a soft texture.
- ½ cup granulated sugar: Enhances sweetness and moisture.
- ½ teaspoon salt: Balances the flavors.
- 1 cup water: Keeps the cake moist.
- ½ cup buttermilk: Adds richness and a slight tang.
- ½ cup sour cream: Contributes to the cake’s moistness and flavor.
- 4 large egg whites: Creates a light, airy texture.
- 1 teaspoon vanilla extract: Infuses the cake with warm, comforting flavor.
- ½ teaspoon almond extract: Enhances the cake with a hint of nuttiness.
- 4 ounces cream cheese, softened: Adds richness to the frosting.
- ½ cup butter, softened: Provides a creamy base for the frosting.
- 1 teaspoon vanilla extract: For the frosting, to tie the flavors together.
- ½ teaspoon almond extract: Adds depth to your frosting.
- 3 cups confectioners’ sugar: Sweetens and thickens the frosting.
- 1 tablespoon milk: Adjusts consistency for spreading.
- Sprinkles, optional: For a fun, festive touch.
What You’ll Need (Gear)
- Mixing bowls: For combining your ingredients.
- Electric mixer: To ensure a fluffy batter and smooth frosting.
- Measuring cups and spoons: For accurate ingredient measurements.
- Rubber spatula: Helpful for scraping down the sides of bowls.
- Sheet cake pan (18×13 inches): The perfect size for baking and serving.
- Cooling rack: To cool your cake evenly after baking.
- Offset spatula: Ideal for frosting the cake smoothly.
Method: Doctored Cake Mix White Sheet Cake

Step 1: Prepare Your Oven and Pan
Preheat your oven to 350°F (175°C). Grease and flour your sheet cake pan to ensure easy removal after baking.
Step 2: Combine Dry Ingredients
In a large mixing bowl, whisk together the white cake mix, all-purpose flour, granulated sugar, and salt until well combined.
Step 3: Mix Wet Ingredients
In another bowl, mix together the water, buttermilk, sour cream, egg whites, vanilla extract, and almond extract. Whisk until smooth.
Step 4: Combine Wet and Dry Ingredients
Gradually add the wet mixture to the dry ingredients, mixing on medium speed with an electric mixer until just combined. Do not overmix; a few lumps are okay.
Step 5: Bake the Cake
Pour the batter into the prepared sheet cake pan and spread it evenly. Bake in the preheated oven for 25-30 minutes or until a toothpick inserted into the center comes out clean.
Step 6: Cool the Cake
Once baked, remove the cake from the oven and allow it to cool in the pan for 10 minutes. Then, transfer it to a cooling rack to cool completely.
Step 7: Prepare the Frosting
In a mixing bowl, beat the softened cream cheese and butter with an electric mixer until creamy. Gradually add the confectioners’ sugar, vanilla extract, almond extract, and milk. Beat until smooth and fluffy.
Step 8: Frost the Cake
Once the cake is completely cooled, use an offset spatula to spread the frosting evenly over the top. Add sprinkles if desired for a festive touch.
Step 9: Slice and Serve
Cut the cake into squares or rectangles, and serve to your eager guests. Enjoy the compliments!
Make It Diet-Friendly

- Gluten-Free: Substitute the all-purpose flour with a gluten-free flour blend.
- Lower Sugar: Use a sugar substitute in place of granulated sugar and confectioners’ sugar.
- Reduced Fat: Opt for low-fat cream cheese and butter alternatives.
- Non-Dairy: Replace buttermilk and sour cream with non-dairy alternatives like almond or coconut yogurt.
Frequent Missteps to Avoid
- Overmixing: Mixing the batter too much can lead to a dense cake. Mix until just combined.
- Not Measuring Accurately: Ensure your measurements are precise to achieve the right texture and flavor.
- Skipping the Cooling Step: Frosting a warm cake can melt the frosting. Always let it cool completely.
- Using Cold Ingredients: Make sure your cream cheese and butter are at room temperature for easier mixing.
Shelf Life & Storage
The Doctored Cake Mix White Sheet Cake can be stored at room temperature for up to 3 days in an airtight container. If you want to keep it longer, refrigerate it for up to a week. For the best taste and texture, it’s recommended to consume it within the first few days, but you can freeze individual slices wrapped tightly in plastic wrap for up to 2 months.
FAQ
Can I use a different flavor of cake mix?
Absolutely! Feel free to experiment with different flavors like chocolate or lemon. Just remember to adjust the extracts accordingly to complement the new flavor.
How do I know when the cake is done baking?
A toothpick inserted into the center of the cake should come out clean or with a few moist crumbs. If it comes out with wet batter, it needs more time.
Can I make this cake ahead of time?
Yes, you can bake the cake a day in advance and store it wrapped in plastic wrap at room temperature. Frost it the day you plan to serve it for the best results.
What can I use instead of egg whites?
You can use aquafaba (the liquid from canned chickpeas) as a vegan alternative, using about 3 tablespoons for each egg white. Alternatively, use a commercial egg replacer according to package instructions.
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Let’s Eat
The Doctored Cake Mix White Sheet Cake is not just a dessert; it’s an experience. With its fluffy texture, rich frosting, and the ability to easily customize it for any occasion, this cake will surely become a staple in your baking repertoire. With just a few simple ingredients and steps, you can whip up a delightful treat that will impress friends and family alike. So why wait? Grab your ingredients and start baking this delicious masterpiece today!

Doctored Cake Mix White Sheet Cake
Equipment
- Mixing Bowls
- Electric Mixer
- Measuring cups and spoons
- Rubber spatula
- Sheet cake pan (18x13 inches)
- Cooling rack
- Offset spatula
Ingredients
Cake Ingredients
- 1 box white cake mix 15.25-ounce
- 1 cup all-purpose flour
- 0.5 cup granulated sugar
- 0.5 teaspoon salt
- 1 cup water
- 0.5 cup buttermilk
- 0.5 cup sour cream
- 4 large egg whites
- 1 teaspoon vanilla extract
- 0.5 teaspoon almond extract
Frosting Ingredients
- 4 ounces cream cheese softened
- 0.5 cup butter softened
- 1 teaspoon vanilla extract
- 0.5 teaspoon almond extract
- 3 cups confectioners' sugar
- 1 tablespoon milk
- sprinkles optional
Instructions
Preparation and Baking
- Preheat your oven to 350°F (175°C). Grease and flour your sheet cake pan to ensure easy removal after baking.
- In a large mixing bowl, whisk together the white cake mix, all-purpose flour, granulated sugar, and salt until well combined.
- In another bowl, mix together the water, buttermilk, sour cream, egg whites, vanilla extract, and almond extract. Whisk until smooth.
- Gradually add the wet mixture to the dry ingredients, mixing on medium speed with an electric mixer until just combined. Do not overmix; a few lumps are okay.
- Pour the batter into the prepared sheet cake pan and spread it evenly. Bake in the preheated oven for 25-30 minutes or until a toothpick inserted into the center comes out clean.
- Once baked, remove the cake from the oven and allow it to cool in the pan for 10 minutes. Then, transfer it to a cooling rack to cool completely.
Frosting and Serving
- In a mixing bowl, beat the softened cream cheese and butter with an electric mixer until creamy. Gradually add the confectioners' sugar, vanilla extract, almond extract, and milk. Beat until smooth and fluffy.
- Once the cake is completely cooled, use an offset spatula to spread the frosting evenly over the top. Add sprinkles if desired for a festive touch.
- Cut the cake into squares or rectangles, and serve to your eager guests. Enjoy the compliments!
Notes
- Do not overmix the batter to keep the cake light and fluffy.
- Ensure cream cheese and butter are at room temperature before making frosting for a smooth texture.
- Store the cake in an airtight container at room temperature for up to 3 days or refrigerate for up to a week.
