Ingredients:

• Butter, for greasing the cake pan
• 1 1/2 cups all-purpose flour (see recipe note)
• 1 1/2 teaspoons baking powder
• 1/4 teaspoon salt
• 5 large eggs, at room temperature
• 1 cup granulated sugar
• 1 teaspoon vanilla extract
• 1/2 cup (1 stick) unsalted butter, melted and cooled
• For the filling
• 3/4 cup heavy cream
• 3/4 cup sour cream or crème fraiche
• 4 teaspoons powdered sugar
• 1/2 teaspoon vanilla extract
• 1/2 cup raspberry jam
• Extra powdered sugar for sprinkling