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Sourdough Discard Carrot Bundt Cake: Moist, Tangy & Wonderfully Spiced

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This sourdough discard carrot bundt cake is ultra-moist, warmly spiced, and topped with a tangy cream cheese frosting and cinnamon-walnut crunch. A stunning and delicious way to use up leftover sourdough starter.

  • Author: Amanda
  • Prep Time: 20 minutes
  • Cook Time: 50 minutes
  • Total Time: 1 hour 10 minutes
  • Yield: 12 slices 1x
  • Category: Dessert
  • Method: Baking
  • Cuisine: American
  • Diet: Vegetarian

Ingredients

Scale

**Cake:**

3 large eggs (150g)

⅓ cup neutral oil (80g)

⅓ cup sourdough discard (75g)

1 tsp vanilla extract (4g)

1¾ cups all-purpose flour (245g)

2 cups granulated sugar (400g)

2 tsp baking soda (10g)

1 tsp baking powder (5g)

1 tbsp cinnamon (8g)

1 tsp salt (6g)

2½ cups shredded carrots (280g)

1 cup crushed pineapple, drained (225g)

1 cup chopped walnuts or pecans (optional) (100g)

**Frosting:**

¾ cup cream cheese, softened (175g)

⅓ cup butter, softened (75g)

1½ tsp vanilla extract (6g)

3 cups powdered sugar (360g)

1 tbsp milk (15g)

**Topping:**

⅛ cup brown sugar (30g)

⅛ cup granulated sugar (30g)

1 tsp cinnamon (2g)

⅓ cup chopped walnuts (40g)

Instructions

1. Preheat oven to 350°F (175°C) and grease a bundt pan.

2. Whisk eggs for 30 seconds until airy. Stir in oil, discard, and vanilla.

3. Add flour, sugar, baking soda, baking powder, cinnamon, and salt. Mix until just combined.

4. Fold in carrots, pineapple, and optional nuts.

5. Pour into greased pan. Bake 50–55 minutes or until toothpick comes out clean.

6. Cool 15 minutes, then invert onto a wire rack to cool completely.

7. Beat cream cheese, butter, vanilla, powdered sugar, and milk until smooth.

8. Pipe frosting around cooled cake.

9. Mix cinnamon crunch topping and sprinkle over frosting immediately.

Notes

Use finely grated carrots for a soft, even texture.

For dark pans, check for doneness at 45 minutes.

Let cake cool fully before frosting to prevent melting.

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