- Preheat oven to 350F (175C). Grease and flour a 9x13 inch baking pan. 
- In a large bowl, whisk together the flour, sugar, cocoa powder, baking powder, baking soda, and salt. 
- In a separate bowl, combine the buttermilk, oil, eggs, and vanilla extract. 
- Gradually add the wet ingredients to the dry ingredients, mixing until just combined. Be careful not to overmix. 
- Slowly pour in the hot coffee, mixing until the batter is smooth. The batter will be thin. 
- Stir in the chocolate chips. 
- Pour the batter into the prepared pan. 
- Bake for 30-35 minutes, or until a toothpick inserted into the center comes out with moist crumbs attached. 
- Let the cake cool in the pan for 10 minutes before inverting it onto a wire rack to cool completely. 
- Optional: Prepare a chocolate fudge frosting and spread it evenly over the cooled cake. 
- Optional Tips: For a more intense coffee flavor, add 1-2 teaspoons of instant espresso powder to the dry ingredients. Buttermilk can be substituted with 1 cup of milk mixed with 1 tablespoon of white vinegar; let sit for 5 minutes before using. For a richer flavor, use dark chocolate chips instead of semi-sweet.