Mini Stacked Birthday Cake

Ingredients

• 1 cup flour
• 1 tsp baking powder
• 1/4 tsp salt
• 1/2 cup butter (room temperature)
• 3/4 cup white sugar
• 4 egg yolks
• 1/2 tsp vanilla extract
• Scant 1/2 cup milk (1% or 2% is fine)
• 1 tbsp sprinkles (optional)
• 1 cup frosting of choice