Chocolate-Malt Cake

Ingredients

• 2/3 cup milk crumbs
• 6 tablespoons ovaltine chocolate malt mix
• 1 1/2 ounces high-quality white chocolate (such as lindt or perugina), chopped
• 1 1/3 cups ovaltine chocolate malt mix
• 4 ounces bittersweet chocolate (70% to 72% cacao), chopped
• 1 teaspoon mild-flavored (light) molasses
• pinch of coarse kosher salt
• 1/2 cup heavy whipping cream
• 1/2 cup light corn syrup
• 1/4 cup sugar
• nonstick vegetable oil spray
• 2 ounces bittersweet chocolate (70% to 72% cacao), chopped
• 1 3/4 cups all purpose flour
• 3/4 cup unsweetened cocoa powder
• 2 teaspoons baking powder
• 1 teaspoon coarse kosher salt
• 3/4 cup (1 1/2 sticks) unsalted butter, room temperature
• 2 1/4 cups sugar
• 3 tablespoons light corn syrup
• 3 large eggs
• 3/4 cup buttermilk
• 1/3 cup vegetable oil
• 1 teaspoon vanilla extract
• 1/2 cup whole milk
• 3 tablespoons ovaltine classic malt mix
• 2 cups mini marshmallows