Preheat your oven to 350°F (175°C) and prepare two 9-inch round cake pans with parchment paper.
In a large bowl, whisk together the flour, sugar, cocoa powder, baking soda, and salt until well combined.
In another bowl, mix the almond milk, vegetable oil, apple cider vinegar, and vanilla extract until smooth.
Pour the wet ingredients into the dry ingredients and mix until just combined, being careful not to overmix.
Add the red food coloring to the batter and gently mix until the color is even.
Divide the batter evenly between the prepared pans and smooth the tops with a spatula.
Bake for 25-30 minutes or until a toothpick inserted in the center comes out clean.
Allow the cakes to cool in the pans for 10 minutes, then transfer to wire racks to cool completely.