Lyndsay Sung’s Funfetti Cake With Vanilla Buttercream & Birthday Cake

Ingredients

• 1¼ cups (310 milliliters) soy milk
• 2 teaspoons apple cider vinegar
• ½ cup (125 milliliters) aquafaba
• ½ cup (112 grams) unsalted plant-based butter, room temp
• ½ cup (125 milliliters) vegetable oil
• 1½ cups (300 grams) granulated white sugar
• 1 tablespoon pure vanilla extract
• 1 teaspoon vanilla bean paste
• 3 cups (390 grams) cake flour
• 1 tablespoon baking powder
• 1 teaspoon baking soda
• 1 teaspoon fine sea salt
• 1½ cups (150 grams) rainbow sprinkles
• ½ cup (100 grams) granulated white sugar
• 1 tablespoon golden brown sugar
• ¾ cup (96 grams) cake flour
• ½ teaspoon baking powder
• ½ teaspoon fine sea salt
• 1 tablespoon rainbow sprinkles
• ¼ cup vegetable oil
• 1 teaspoon pure vanilla extract
• 2 cups (454 grams) unsalted plant-based butter, room temp
• 3 cups (380 grams) icing sugar, sifted
• 2 teaspoons pure vanilla extract
• Pinch of salt + more to taste
• 1 cup (250 milliliters) aquafaba
• ½ teaspoon cream of tartar
• 1 cup (130 grams) icing sugar
• 1 cup (200 grams) granulated white sugar
• 2 cups (454 grams) unsalted plant-based butter
• 2 teaspoons pure vanilla extract
• ½ teaspoon vanilla bean paste