• Start by preheating your oven to 350°F so it’s ready when your batter is.
  
• In a medium glass bowl, sift together the cake flour, baking powder, and salt, then set aside.
  
• In a large mixing bowl, beat the butter and sugar with a hand mixer until the mixture turns pale and fluffy.
  
• In a separate bowl, whisk together the eggs, vanilla extract, and sour cream until smooth and creamy.
  
• Slowly add the egg mixture to the butter mixture, one-third at a time, mixing in between each addition until fully combined.
  
• Now mix in the dry ingredients, also in thirds. Beat gently after each addition until the batter is nice and smooth.
  
• Divide the finished batter evenly between 3 clean bowls.
  
• Tint one bowl red and one blue using just a touch of food coloring (a toothpick is great for this!). Leave the third bowl plain for the white layer.
  
• Stir each bowl of batter well with a spatula until the color is fully mixed in.
  

Bundt cake pan coating

• To prep your pan, grease the inside thoroughly with vegetable shortening, making sure every corner is lightly coated.
  
• Dust a little flour over the greased pan, turning it to coat every surface, then gently tap out any excess.
  
• Pour the red batter into the bottom of the prepared Bundt pan and spread it evenly.
  
• Carefully spoon the white batter right on top—do not swirl or mix the layers.
  
• Add the blue batter on top of the white one, again keeping the layers separate.
  
• Bake the cake for 50–65 minutes, or until a toothpick poked into the center comes out clean.

  Let the cake cool in the pan for about 10 minutes, then run a butter knife around the edges to help loosen it.
  
• Turn the cake out onto a wire rack, cover loosely with a clean towel, and let it cool completely—about 1-2 hours.
  

Vanilla glaze

• Scoop the tub of vanilla buttercream frosting into a candy melting pot or a small saucepan.
  
• Gently heat it up, stirring constantly with a heat-safe spatula, until it thins to a pourable glaze.
  

Garnish

• Once the cake is fully cool, place it on a cake stand and drizzle the warm glaze all over the top.
  
• Let the glaze set for at least 2 hours before moving on to the final step.
  
• When everything is fully set, decorate with your red, white, and blue chocolate stars—and enjoy your festive creation!