Ingredients
Scale
- 2 cups (248g) all-purpose flour
- 2 teaspoons baking powder
- ¾ teaspoon salt
- 1 cup (226g) unsalted butter, melted
- 1 ½ cups (300g) granulated sugar
- 4 large eggs
- 1 teaspoon vanilla extract
- 1 cup (237ml) buttermilk
- 1 cup (225g) rainbow sprinkles
- 1 cup (226g) unsalted butter, softened
- 4 cups (452g) powdered sugar
- 1 teaspoon (15 ml) vanilla extract
- ½ teaspoon salt
- 2-5 tablespoons (30-75ml) heavy whipping cream
- ½ cup (112g) sprinkles plus more for topping
Instructions
- Preheat the oven to 350°F and grease a 9×13-inch baking pan.
- In a medium bowl, whisk together the flour, baking powder, and salt; set aside.
- In a large bowl, beat the melted butter and granulated sugar with a mixer on medium speed until smooth.
- Add the eggs one at a time, then mix in the vanilla extract.
- Gradually mix the buttermilk into the dry ingredients, starting and ending with the buttermilk, mixing just until combined. Scrape the bowl as needed. Stir in the rainbow sprinkles.
- Pour the batter into the prepared baking pan and bake for 30-40 minutes or until a toothpick comes out clean. Allow to cool completely before frosting.
- For the frosting, beat the softened butter until creamy. Gradually add the powdered sugar, mixing until a crumbly mixture forms.
- Mix in the vanilla extract and salt, then add heavy cream until you reach your desired consistency. Stir in more sprinkles as desired.
- Frost the cake with the prepared frosting and add extra sprinkles on top. Store until serving.
Notes
For a lighter texture, ensure all ingredients are at room temperature before mixing.
The cake can also be made into 24 cupcakes or two 9-inch rounds if preferred.
Store any leftovers in a loosely covered container for up to 2 days.
Nutrition
- Serving Size: 1 slice
- Calories: 392
- Sugar: 37g
- Sodium: 245mg
- Fat: 19g
- Saturated Fat: 11g
- Unsaturated Fat: 7g
- Trans Fat: 0g
- Carbohydrates: 55g
- Fiber: 0g
- Protein: 3g
- Cholesterol: 92mg
Nutritional information is an estimate. The nutritional values for your final dish may vary based on measuring differences and products used.