In a large bowl, add Butter (1/2 cup), Caster Sugar (1 cup) and mix it together.
Then, add Large Egg (2) one at a time and mix together.
Then, add Vanilla Extract (1 teaspoon), Lemon (2), Lemon (2), Sour Cream (1/2 cup) and mix everything.
Lastly, add All-Purpose Flour (1 1/2 cup), Baking Powder (2 teaspoon), Salt (1/4 teaspoon). Mix everything.
Line the cupcake tin with cupcake liners and add one scope of batter to each cupcake liner. Bake the cupcakes at 350 degrees F (180 degrees C) for 18 minutes. Cool them completely.
In the stand mixer, add Cream Cheese (8 ounce), Powdered Confectioners Sugar (4 cup), Butter (1/4 cup) and Vanilla Extract (1 teaspoon).
Take a small portion of frosting and add pink gel food coloring. Take some marshmallows and cut them diagonally. Apply the pink frosting to the marshmallows. Take a cupcake, spread some frosting and put marshmallows on it as two bunny ears. Serve and enjoy!