Rich Fudgy Velvet Bars with Creamy Frosting - Yummy Gusto

Ingredients

• ¾ stick (85g) unsalted butter
• 1 cup (200g) white sugar
• ¼ cup (55g) soft brown sugar
• 3 whole eggs at room temp
• 1 egg yolk, separated
• 1 teaspoon of vanilla essence
• ⅓ cup (72g) neutral oil
• ¼ cup (25g) cocoa powder
• ¾ cup (90g) plain flour
• 1 tablespoon vinegar
• 1 tablespoon cornstarch mix
• ¼ teaspoon table salt
• ½ teaspoon red gel food dye
• ¾ cup white chocolate pieces (optional)
• 4 oz (114g) softened cream cheese
• ¾ stick (85g) butter, softened
• 4 cups (480g) icing sugar, sifted
• 1 teaspoon pure vanilla essence