Barefoot Contessa's Flag Cake

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Details

15 Ingredients

• 711 ml 3 cups sugar
• 711 ml 3 cups flour
• 5 ml 1 tsp kosher salt
• 5 ml 1 lb confectioners
• 7.50 ml 1 pint blueberries
• 7.50 ml 1 1/2 tsps pure vanilla extract
• 237 ml 1 tsp kosher salt
• 5 ml 1 cup sour cream , at room temperature
• 79 ml 1/3 cup cornstarch
• 79 ml 1 lb unsalted butter , at room temperature
• 6 x 1 1/2 pints raspberries
• 6 x 6 extra-large eggs , at room temperature
• 270 ml 18 Tbsps unsalted butter , at room temperature
• 270 ml For the icing
• 1 1/2 lbs cream cheese , at room temperature