✓ Preheat the oven to 350°F and grease two 9-inch round cake pans

✓ In a medium bowl, whisk together flour, cocoa powder, baking soda, and salt

✓ In a large bowl, use an electric mixer to beat the sugar and butter until light and fluffy

✓ Beat in the eggs one at a time, followed by the vanilla extract

✓ With the mixer on low speed, gradually add the flour mixture to the wet ingredients in three parts, alternating with the buttermilk

✓ Beat in the vinegar and red food coloring

✓ Divide the batter evenly between the prepared pans and smooth the tops

✓ Bake for 30 minutes, or until a toothpick inserted into the center comes out clean

✓ Allow the cakes to cool in the pans for 10 minutes, then transfer them to a wire rack to cool completely

✓ For the frosting, beat the cream cheese and butter until smooth and creamy

✓ Gradually add the powdered sugar, beating until smooth and creamy

✓ Beat in the vanilla extract and salt