Triple Chocolate Bundt™

Ingredients

• vegetable shortening, to taste
• 2 cups all-purpose flour, plus more, to taste, for dusting the cake pan
• 3/4 cup unsweetened cocoa powder
• 1/2 teaspoon baking powder
• 1 teaspoon table salt
• 1 1/2 cups butter, room temperature
• 3 cups granulated sugar
• 5 large eggs, room temperature
• 1 1/4 cups buttermilk
• 2 teaspoons instant espresso
• 2 teaspoons vanilla extract
• 1 cup bittersweet chocolate morsels, 60% cacao
• 3/4 cup semisweet chocolate morsels
• 3 tablespoons butter
• 1 tablespoon light corn syrup
• 1/2 teaspoon vanilla extract
• 1 cup confectioners' sugar
• 1 tablespoon buttermilk, plus more, to taste
• 1/4 teaspoon vanilla extract