At a glance
You're making a light, airy sponge cake loaded with fresh summer berries and topped with a buttery oat crumble—the fruity-meets-crunchy combo is what makes this Czech bubblanina so irresistible. The most important step is thoroughly greasing and flouring your tin so the cake releases cleanly, and don't skip hand-rubbing the crumble topping to get that perfect crumbly texture.
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Whisk the eggs
Whisk the eggs with the cane sugar in a stand mixer fitted with the whisk attachment. Beat until the mixture thickens and turns pale and airy.
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Add the fat
Add the melted baking fat and milk. Keep whisking until everything is well combined.
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Make the batter
Thoroughly mix the baking powder into the flour. Sift it into the mixture in the stand mixer and mix again until you have a smooth batter.
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