Preheat your oven to 350°F (180°C) and prepare a baking pan by lining it with parchment paper or greasing it lightly. TIP: Spread a thin, even layer of butter on the parchment paper to ensure the slices release easily.
In a large bowl, whisk together the flour, powdered sugar, baking powder, and grated orange zest. TIP: Grate the orange zest just before baking to preserve its freshness.
Melt the butter and whisk it together with the eggs, orange juice, and vanilla sugar.
Pour the wet ingredients into the dry ingredients and mix until just combined. TIP: Avoid overmixing to keep the slices light and tender.
Pour the batter into the prepared baking pan and spread it evenly with a spatula. TIP: A damp spatula will help you smooth the batter easily.
Bake for 25-30 minutes, or until golden brown. TIP: Check for doneness with a toothpick – if it comes out clean, the cake is ready.
Let the cake cool in the pan for 10 minutes, then lift it out and place it on a wire rack to cool completely.
Dust with powdered sugar, slice, and serve. TIP: Garnish with fresh orange segments or whipped cream for an extra touch.
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