Best Raspberry White Chocolate Sheet Cake Recipe | Flavour Network

Ingredients

• 2 ¾ cup all-purpose flour, plus more for raspberries
• 2 tsp cornstarch
• 2 ½ tsp baking powder
• ½ tsp salt
• 1 cup unsalted butter, softened, plus more for the pan
• 1 ½ cups granulated sugar
• 3 large eggs
• 2 tsp vanilla extract
• 1 cup whole milk
• ½ cup sour cream
• 1 cup fresh or frozen raspberries, do not thaw
• 2 cups fresh or frozen raspberries
• 3 Tbsp granulated sugar
• 2 tsp water
• 1 ½ tsp cornstarch
• 113g white chocolate, chopped, plus more for decorating
• ¾ cup unsalted butter, softened to room temperature
• 3-4 cups powdered sugar
• 2 Tbsp milk
• 1 tsp vanilla extract
• Fresh raspberries, for decorating