Preheat your oven to 350 degrees and thoroughly grease a 12-cup bundt cake pan or 10-inch tube pan.
Put the powdered sugar, buttery sticks, and brown sugar in a large mixing bowl. Cream with a mixer (start it on low) until thoroughly blended and smooth.
In a medium bowl, whisk together the aquafaba, yogurt, espresso or coffee, and olive oil until smooth.
In a large bowl, whisk together the flour, cocoa powder, baking powder, salt, and baking soda.
Add about half of the flour mixture to the buttery mixture and stir or beat on low speed until incorporated. Pour in half of the aquafaba mixture and stir or beat until mostly absorbed. Repeat with the remaining flour mixture followed by the remaining aquafaba mixture, stirring until just combined. Do not over-mix; some small lumps are okay.
Fold in the chocolate chunks or morsels.
Spoon the batter into your prepared pan. Tap the pan on the counter to release any air bubbles, and even out the surface with a spatula.
Bake for 45 to 55 minutes. It’s tough to judge doneness since you want the center to remain “wet.” Look for the top to set and the edges to pull away from the sides of the pan, rather than using the traditional toothpick test.
Let the cake cool completely before carefully removing it to a serving platter.
Dark Cocoa Glaze
In a medium bowl, whisk together the powdered sugar and cocoa powder. Slowly whisk in the water as needed. It should be thick enough to drizzle and cling to the sides of the cake.
Apply the glaze generously to your tunnel of fudge cake.
Recipe by Go Dairy Free at https://www.godairyfree.org/recipes/vegan-tunnel-of-fudge-cake