Birthday Cake Cupcakes

Ingredients

• 3 cups All-Purpose Flour
• 2 tsp baking powder
• 1/2 tsp baking soda
• 1/4 tsp Salt
• 1 Cup Unsalted Butter room temperature
• 1 1/3 Cups Sugar
• 3 eggs room temperature
• 1 tsp Vanilla Extract
• 1 Cup Buttermilk
• ¼ Cup Rainbow Sprinkles + more for garnish
• 6 Cups Powdered Sugar
• 2 Cups Unsalted Butter , room temperature
• 4 Tbsp Heavy Whipping Cream
• 2 Tsp Vanilla Extract