Preheat the oven at 170ºC/340ºF conventional oven and line 2x 20 cm/8 inch baking pans with parchment paper.
In a bowl, sift all of the dry ingredients together. Give it a stir to make sure everything is combined.
300 g all-purpose flour, 300 g granulated sugar, 2 tablespoon dutch processed unsweetened cocoa powder, 1 teaspoon baking powder, 1 teaspoon baking soda, 1 teaspoon salt
In another mixing bowl add all of the wet ingredients, and with a hand whisk, whisk them together until combined. (Add 1-2 teaspoon more red gel food color if it's not a bright red. Food colors are very different and you therefore might need more depending on the brand you're using). Be sure to not mix the ingredients too vigorously so the eggs don’t get over mixed.
165 g buttermilk, 180 g sour cream, 110 g vegetable oil, 2 large eggs, 2 teaspoon white vinegar, 2 teaspoon vanilla extract, 1 teaspoon red gel food color
Slowly pour the wet ingredients into the flour mixture while gently stirring it all together. Make sure there are no lumps left in the batter.
Divide the cake batter into the prepared baking pans and bake them for 28-30 minutes or until a cake tester comes out clean.
Let the cakes cool on a cooling rack. After 5 minutes, gently remove the cakes from the cake tins and let the cakes cool down completely.