best 4th of july red, white and blue velvet cake

Ingredients For best 4th of july red, white and blue velvet cake

• 5 c

  all-purpose flour (spoon and sweep)
• 4 tsp

  baking powder
• 1 1/2 tsp

  salt
• 2 c

  milk
• 2 tsp

  vanilla extract
• 3 1/4 c

  sugar
• 2 c

  vegetable oil
• 6 lg

  egg whites
• 2 tsp

  white vinegar
• red and blue food coloring
• 3 pkg

  packages cream cheese
• 1 1/2 c

  3 sticks) unsalted butter, softened
• 12 c

  3-pounds) confectioners' sugar
• 1 Tbsp

  vanilla extract
• red food coloring
• blue decorating sugar