Ingredients
Scale
- 1 cup (224g) unsalted butter, room temp
- 2 cups (400g) granulated sugar
- 1/2 cup (110g) vegetable or canola oil
- 4 large eggs, room temp
- 1 tbsp vanilla extract
- 1/2 cup (120g) full fat sour cream, room temp
- 2 1/2 tsp baking powder
- 1/2 tsp baking soda
- 1 tsp kosher salt
- 3 1/4 cups (418g) all-purpose flour, spooned and leveled
- 1 cup (225g) buttermilk*, room temp
- 3/4 cup (140g) rainbow jimmies sprinkles
- 1 1/2 cups (336g) unsalted butter, room temp
- 5 cups (550g) powdered sugar, spooned and leveled
- 1 tbsp vanilla extract
- 2-3 tbsp milk, room temp
- 1/2 cup (90g) sprinkles for decorating
Instructions
- Preheat the oven to 350°F. Grease and line the bottoms of 3 – 9" cake pans with parchment paper. If using 8" pans, leave out about 1 cup of batter.
- In a mixer, combine the butter and sugar on medium-high speed for about 3 minutes until light and fluffy.
- With the mixer on low, add the oil and mix until fully combined. Incorporate the eggs, two at a time, followed by the vanilla. Then add the sour cream.
- Mix in the baking powder, baking soda, and salt. Add half the flour and mix until partially incorporated. Pour in the buttermilk, mix roughly, then add the remaining flour and mix until smooth.
- Use a spatula to mix by hand, scraping down the bowl. Fold in the sprinkles.
- Divide the batter among the pans, spreading it evenly. Bake for 30-35 minutes for 9" cakes or 35-40 minutes for 8" cakes, until a toothpick comes out clean.
- Cool the cakes in the pans for 30 minutes, then remove and cool completely on a rack. Refrigerate for an hour if frosting the same day, or wrap and refrigerate overnight.
Notes
Make sure the eggs and dairy are at room temperature for optimal mixing.
Baking times may vary based on your oven; check for doneness with a toothpick.
If not using right away, wrap the cooled cakes in plastic wrap to preserve freshness.
Nutrition
- Serving Size: 1 slice
- Calories: 450
- Sugar: 39g
- Sodium: 230mg
- Fat: 22g
- Saturated Fat: 14g
- Unsaturated Fat: 8g
- Trans Fat: 0g
- Carbohydrates: 58g
- Fiber: 1g
- Protein: 4g
- Cholesterol: 90mg
Nutritional information is an estimate. The nutritional values for your final dish may vary based on measuring differences and products used.