Heat oven to 350 degrees and line cupcake tin with paper liners.
Beat the butter and sugar together until it becomes creamy.
Sift together the flour and baking powder.
Add one egg at a time to the butter/sugar combination. Beat to mix after each egg.
Add the vanilla and combine the wet mixture with the dry ingredient mixture. Stir to mix.
Add the milk and stir gently to mix all ingredients.
Next, add slowly add the orange juice and make sure the batter is well mixed.
Fill cupcake liners about 2/3 full and bake for 15-18 minutes.
Allow to cool for at least 20 minutes before frosting!
Frost and enjoy!