Blueberry Pistachio Layer Cake

INGREDIENTS

For the blueberry syrup:

12 oz

blueberries

1 cup

granulated sugar

1 cup

water

For the cake:

large egg whites

1 cup

unsalted butter, softened

2 1/4 cups

granulated sugar (424 g)

2 tsp

vanilla extract

1 cup

light sour cream

1/2 cup

milk

2 3/4 cups

flour (340 g)

1 tsp

seat salt

1 tsp

baking soda

For the frosting:

2 cups

unsalted butter, softened

8 cups

powdered sugar

2 tbsp

heavy whipping cream

Prepared blueberry sauce

For the topping:

1 cup

white chocolate chips

3/4

to 1 cup heavy whipping cream

1/4 cup

pistachios for garnish