125grams(about ½ cup + 1 tablespoon) unsalted butter65°F / 18°C, cut into pieces
125grams(½ cup + 2 tablespoons) white granulated sugar
40milliliters(about 3 tablespoons) avocado oil
1teaspoonvanilla paste or extract
150grams(1¼ cups) all-purpose flour
1teaspoonbaking powder
¼teaspoonsaltplus an extra pinch for the egg whites
1tablespoonnatural cocoa powder
1tablespoonpowdered sugarfor dusting on top
Instructions
Preheat the oven to 340°F (170°C). Grease 6 mini bundt pans thoroughly with avocado oil and set aside.
In a very clean bowl, whip the egg whites and a pinch of salt with a handheld mixer on medium-high speed until soft peaks form. Set aside.
In a large bowl, beat the butter and sugar on medium-high speed for 2–3 minutes, until light and fluffy.
Add the egg yolks, avocado oil, and vanilla extract, and mix until smooth and well combined.
In a separate bowl, whisk together the flour, baking powder, and the remaining salt. Add to the wet ingredients and mix on low speed just until combined.
Using a spatula, gently fold in the whipped egg whites in three additions, being careful not to deflate the batter.
Divide the batter evenly into two bowls:
Vanilla layer: Leave one bowl plain.
Chocolate layer: Mix the cocoa powder into the second bowl until fully combined.
Transfer each batter to a piping bag. Pipe a layer of vanilla batter into the bases of the prepared bundt pan, then pipe the chocolate layer on top.
Bake for 12–15 minutes, or until a wooden skewer inserted into the center comes out clean.
Let the cakes cool in the pan for 5 minutes, then carefully turn them out onto a wire rack to cool completely.
Once cooled, dust lightly with powdered sugar or caramel sauce before serving.