Winter Wonderland Ombré Cake

Ingredients

• 3 + 1/4 cups (390g) all-purpose flour
• 2 teaspoons baking powder
• 1 teaspoon baking soda
• 1/2 teaspoon salt
• 1/2 cup (1 stick / 115g) unsalted butter, softened to room temperature
• 1/2 cup (120mL) vegetable oil
• 1 + 3/4 cups (350g) granulated sugar
• 2 large eggs, at room temperature
• 2 large egg whites, at room temperature
• 3 teaspoons LorAnn Butter Vanilla Bakery Emulsion
• 3/4 cup (180g) full-fat sour cream
• 1/2 cup (120mL) milk
• LorAnn Blue Liquid Gel Food Coloring
• 1+ 1/2 cups (340g) unsalted butter, softened to room temperature
• 6 cups (780g) powdered sugar
• 2 teaspoons LorAnn Butter Vanilla Bakery Emulsion
• 3 to 6 tablespoons milk