Ingredients
Equipment
Method
- Preheat oven to 350°F (175°C). Line a jelly roll pan with parchment paper.
- Whisk together flour, baking powder, and salt. Set aside.
- Beat egg yolks with half the sugar until pale. Add oil, milk, and vanilla.
- Beat egg whites with remaining sugar until stiff peaks form.
- Fold dry ingredients into yolk mixture, then gently fold in egg whites.
- Pour batter into prepared pan and bake 12-15 minutes until golden. Cool completely.
- Beat butter until fluffy. Add powdered sugar and vanilla. Mix in cream to desired consistency.
- Pipe or spoon filling into sponge rectangles. Serve immediately or store airtight.
Notes
Best served within 24-48 hours for peak freshness.
