place pie crust in a 9 inch pie plate and crimp edges
set pie plate on a baking sheet.
Mix Batter
whisk sugar cocoa flour baking powder and salt until uniform
whisk eggs mayonnaise vanilla and hot coffee until smooth
whisk wet into dry just until combined and glossy.
Bake And Cool
pour filling into crust and smooth the top
bake until the center is set and a toothpick inserted near the center comes out with a few moist crumbs 30 to 40 minutes
cool at least 2 hours before slicing for clean cuts and best texture.
Notes
1. use full fat mayonnaise for best texture 2. substitute hot water for coffee to keep flavor mild 3. if crust browns too fast cover edges with foil during the last 10 to 15 minutes 4. serve at room temperature or chilled