Aperol spritz drizzle cake - Better Homes & Gardens Australia

Ingredients

• 2 cups plain flour
• 2 tsp baking powder
• 250g unsalted butter, softened, plus extra to grease tin
• 1 cup caster sugar
• 1 tsp vanilla extract
• 1 large orange, finely grated zest, plus 1 orange, thinly sliced
• 4 free-range eggs, at room temperature
• 1/3 cup sour cream
• 6 sprigs rosemary
• 1/4 cup white sugar
• PROSECCO SYRUP
• 1/4 orange juice
• 2/3 cup dry prosecco
• 2 tsp Aperol
• CREAM CHEESE BUTTERCREAM
• 150g unsalted butter, softened
• 250g cream cheese, softened
• 1 cup icing sugar mixture, sifted