Preheat your oven to 350°F and line a 9x13 inch baking dish with parchment paper, leaving some overhang on the sides for easy removal. While the oven heats, remove your eggs from the refrigerator so they reach room temperature—this helps them emulsify better with the oil and creates a more tender crumb. Measure out all your ingredients and have them ready before you start mixing, as the batter comes together quickly.

In a medium bowl, whisk together the flour, cocoa powder, salt, and espresso powder. The espresso powder won't make the brownies taste like coffee—instead, it deepens the chocolate flavor and adds complexity. Mix thoroughly to break up any cocoa lumps and distribute the leavening evenly, as this prevents dense spots in the finished brownies.

In a large bowl, whisk together the vegetable oil, sugar, vanilla essence, apple cider vinegar, and red food coloring until the mixture is completely uniform in color with no streaks. The vinegar acts as a tenderizer and enhances the chocolate flavor while helping the red color develop its signature depth. Add the room-temperature eggs one at a time, whisking thoroughly after each addition to fully incorporate them into the oil-based mixture.

Add the dry ingredient mixture from Step 2 to the wet mixture from Step 3, stirring just until combined—don't overmix, as this can develop too much gluten and make the brownies tough. Pour the batter into your prepared baking dish and smooth the top with a spatula. Bake for 25-30 minutes, until a toothpick inserted near the center comes out with just a few moist crumbs; these brownies should be fudgy, not cake-like. I like to pull them out when they still look slightly underdone in the center—they'll continue cooking slightly as they cool.

Remove the brownies from the oven and let them cool completely in the baking dish at room temperature, about 1-2 hours. This cooling time is crucial—it allows the structure to set properly so the frosting adheres well and each piece holds together cleanly when cut.

While the brownies cool, add the vegan cream cheese, powdered sugar (sifted to remove lumps), and vanilla essence to a clean bowl. Beat on medium-high speed for 2-3 minutes until the mixture becomes light and fluffy, scraping down the bowl as needed. Gradually add the oat milk one tablespoon at a time, mixing until you reach a spreadable consistency—you want it thick enough to hold its shape but soft enough to spread smoothly across the brownies. I use Kite Hill cream cheese because it has the best tang and most stable texture for frosting.

Spread the frosting from Step 6 evenly over the cooled brownies, using an offset spatula or the back of a spoon to create peaks and swirls if desired. Slice into squares and serve at room temperature, or refrigerate for 30 minutes if you prefer a firmer frosting. The combination of tender chocolate cake and tangy vegan cream cheese frosting creates the perfect balance of flavors and textures.