Preheat your oven to 350°F (180°C). Grease and line a 9-inch (22cm) cake pan with parchment paper.
In a medium bowl, whisk together the flour, baking powder, and a pinch of salt.
In a separate large bowl, beat the eggs with the sugar until light and fluffy. Gradually add the melted butter, vanilla extract, and the zest of both oranges. Squeeze in the juice of both oranges as well.
Gradually add the dry ingredients to the wet ingredients, mixing until just combined. Be careful not to overmix.
Pour the batter into the prepared cake pan and bake for 30-35 minutes, or until a wooden skewer inserted into the center comes out clean. Let the cake cool in the pan for 10 minutes before inverting it onto a wire rack to cool completely.
In a chilled bowl, whip the heavy cream with the powdered sugar until stiff peaks form. Gently fold in a tablespoon of fresh orange juice and some grated orange zest for extra flavor.
Using a serrated knife, slice the cooled cake horizontally into two layers. Spread the bottom layer with the orange-flavored whipped cream. Top with the second layer and frost the entire cake with the remaining cream.
Garnish the cake with fresh orange slices and grated orange zest. Refrigerate for at least 1 hour before serving to allow the frosting to set.
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