Chocolate Egg Cream Cupcakes

Name: Chocolate Egg Cream Cupcakes
Ingredients: 1/4 cup unsweetened cocoa powder; 1/4 cup chocolate syrup; 2/3 cup all-purpose flour; 1/3 cup granulated sugar; 1/4 teaspoon baking soda; 1/4 teaspoon baking powder; 1/4 teaspoon salt; 1/4 cup vegetable oil; 1 large egg; 2 tablespoons whole milk; 1/2 teaspoon vanilla extract; 1 ounce milk chocolate, chopped; 6 tablespoons unsalted butter, cut into pieces, at room temperature; 2 cups confectioners' sugar; 1/4 cup whole milk; 2 tablespoons unsweetened cocoa powder; 2 pinches of salt; 2 tablespoons malted milk powder; Small pretzel rods, for topping