Chocolate-Pecan Cupcakes

Name: Chocolate-Pecan Cupcakes
Cook time: 45 min
Total time: 45 min
Cuisine: American, Southern
Ingredients: 1 1/2 c. all-purpose flour; 1 c. granulated sugar; 1/2 c. Dutch-process cocoa powder; 1 1/4 tsp. baking powder; 1/4 tsp. kosher salt; 2/3 c. canola or vegetable oil; 1/2 c. whole milk, at room temperature; 1 large egg plus 1 yolk, at room temperature; 1 tsp. pure vanilla extract; 1/3 c. boiling water; 1/3 c. packed light brown sugar; 1/4 c. light corn syrup; 3 tbsp. unsalted butter; 1/2 tsp. kosher salt; 1 tbsp. cornstarch; 1 c. chopped toasted pecans, plus more for topping; 1 tbsp. bourbon (optional) or 1/2 teaspoon pure vanilla extract; 1 1/2 oz. bittersweet chocolate, chopped; 8 oz. cream cheese, at room temperature; 1/2 c. (1 stick) unsalted butter, at room temperature; Pinch of kosher salt; 3 1/2 c. confectioners’ sugar; 1 1/2 tsp. pure vanilla extract