Kue Blueberry dengan Frosting Lemon

Bahan-bahan (12 porsi)

• 2 cups flour (, plain / all purpose (Note 1))
• 2 1/2 teaspoons baking powder
• 1/4 tsp salt
• 4 large eggs ((50-55g / 2oz each), at room temp (Note 2))
• 1 1/2 cups sugar (, caster / superfine (Note 3))
• 115 g / 1/2 cup unsalted butter (, melted & HOT)
• 1 cup sour cream (, full fat, at room temperature (Note 5))
• 3 tsp vanilla extract
• 3 tsp vegetable or canola oil ((Note 6))
• 3 tsp lemon zest
• 375 g / 2 1/2 cups blueberries ((Note 7 for frozen))
• 2 tsp flour
• 225 g / 2 sticks unsalted butter (, at room temperature)
• 250 g / 8oz cream cheese (, brick not tub, at room temperature but not too soft (Note 8, esp UK))
• 4 cups soft icing sugar / powdered sugar (, SIFTED)
• 1 tsp vanilla extract
• 2 tbsp lemon juice
• Pinch of salt
• Extra blueberries, lemon slices, edible flowers