Tuxedo Cake: Decadent Chocolate Mousse Cake Recipe

"This copycat Costco tuxedo cake recipe is perfectly rich and decadent, filled with luscious mousse, and topped with silky ganache...."

INGREDIENTS
1/2 cup or 4 oz. good quality dark chocolate chips (90g)
1/3 cup water, warm (80ml)
1/4 cup dark cocoa powder (25g)
3/4 cup good quality white chocolate chips (130g)
2 1/3 cups cold heavy cream or heavy whipping cream, divided (560ml)
1/4 cup powdered sugar (30g)
2 tsp vanilla bean paste or extract (8mL)
1/2 tsp fine salt (3g)
3/4 cup heavy cream (180g)
1 cup + 1 Tbsp dark (60-65% cocoa) chocolate chips (180g)
2 Tbsp unsalted butter, room temperature (30g)
1 Tbsp corn syrup - optional (20g)
1/4 tsp fine salt (2g)
2 1/2 cups granulated sugar (500g)
2 1/4 cups all-purpose flour (280g)
3/4 cup dark or Dutch-processed baking cocoa powder (75g)
2 1/2 tsp baking powder (10g)
1 tsp fine salt (6g)
1 cup unsalted butter, room temp (226g)
1 cup egg whites from a carton or about 7 egg whites, room temp (240g)
1 1/2 cups buttermilk, room temp (360g)
2 Tbsp vegetable oil (30g)
2 tsp vanilla extract (8g)
1 tsp instant espresso - optional
1/2 cup water (120g)
1/2 cup granulated sugar (100g)
1 Tbsp unsweetened cocoa powder (8g)
8-inch cake pans
Spinning cake stand
10-inch greaseproof cake board
Large offset spatula
Electric hand mixer or stand mixer
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