In the bowl of a stand mixer fitted with the paddle attachment, beat butter, granulated sugar, and brown sugar at medium speed until creamy, 3 to 4 minutes, stopping to scrape sides of bowl. Add eggs, one at a time, beating well after each addition. Beat in vanilla. Beat in confectioners’ sugar.
In a medium bowl, stir together flour, ground chocolate, and salt. Add flour mixture and pecans to butter mixture, and beat at low speed until almost combined. Fold batter by hand just until combined.
Spray a 15-cup Bundt pan with baking spray with flour. Spoon batter into prepared pan. Tap pan on counter 3 to 4 times, and smooth with an offset spatula.
Bake until top is set and an instant-read thermometer inserted near center registers at least 160°F (71°C), 50 to 55 minutes. Let cool in pan for 2 hours. Invert cake onto a wire rack, and let cool completely. Pour Milk Chocolate Glaze over cake before serving. Serve slices with additional Milk Chocolate Glaze, if desired.
Notes
*We used Guittard Grand Cacao Drinking Chocolate Sweet Ground Cocoa, a mix of Dutch process cocoa powder and ground chocolate.
Recipe by Bake from Scratch at https://staging.bakefromscratch.com/milk-chocolate-tunnel-of-fudge-bundt-cake/