Malted Chocolate Cake

Ingredients

• Nonstick vegetable oil spray
• 1 1/3 cups all-purpose flour
• 3/4 cup unsweetened cocoa powder
• 1/4 cup malted milk powder
• 1 teaspoon kosher salt
• 1 teaspoon baking soda
• 3/4 teaspoon baking powder
• 2 large eggs
• 1 large egg yolk
• 1 1/2 cups plus 2 tablespoons granulated sugar
• 1 cup buttermilk
• 1/3 cup vegetable oil
• 1/2 teaspoon vanilla extract
• 3/4 cup coffee, cooled, divided
• 2 tablespoons light brown sugar
• 3 ounces bittersweet chocolate, chopped
• 1/2 teaspoon vanilla extract
• 1/2 cup heavy cream
• 1/4 cup malted milk powder
• 1/4 teaspoon kosher salt
• Chocolate pearls; coarsely chopped malt balls (for serving; optional)