we put a secret ingredient in our wacky cake... it's COFFEE! INGREDIENTS: 1/3 cup vegetable oil, plus more for greasing the pan 1 1/2 cups all-purpose flour 1 cup sugar 1/4 cup cocoa powder 1 tsp baking soda 1/2 tsp kosher salt 2 tbsp white vinegar 2 tsp pure vanilla extract 1 cup brewed coffee 2 cups frosting or whipped cream, for serving DIRECTIONS: 1. Position an oven rack in the middle of the oven and preheat to 350 degrees F. Grease an 8-by-8-inch baking pan with vegetable oil. 2. Sift the flour, sugar, cocoa powder, baking soda and salt through a fine-mesh strainer directly into the prepared baking pan. Stir together with a fork (or a silicone whisk if using a nonstick baking pan). Add the oil, vinegar, vanilla and coffee; stir with the fork until fully incorporated. Bake until a toothpick inserted into the center comes out clean, about 35 minutes. 3. Let the cake cool completely in the pan on a wire rack, about 1 hour. Frost the top of the cake with the frosting, if using. Cut into 9 squares and serve each with a dollop of whipped cream, if using