and Tools Make sure you have all your ingredients and tools ready: a muffin tin, cupcake liners, mixing bowls, stand mixer, and a piping bag with a decorating tip.

Preheat Your Oven: Set your oven to 350°F and line the muffin tin with 16 cupcake liners.

Mix the Dry Ingredients: Combine sugar, flour, baking powder, baking soda, and salt in a large bowl.

Incorporate the Butter: Add softened butter to the dry ingredients and beat on low until it resembles a sandy texture.

Add the Wet Ingredients: In another bowl, whisk eggs, sour cream, oil, and vanilla. Slowly add this to the dry mixture, stirring until smooth.

Finish with Milk: Pour in the milk, mixing on medium speed until creamy and lump-free.

Spoon the batter into the cupcake liners, filling each about two-thirds full. Bake for 14–15 minutes, or until a toothpick comes out clean. Cool the cupcakes on a wire rack.

Cream the Butter and Cream Cheese: Beat the butter and cream cheese together until light and creamy.

Incorporate Vanilla and Sugar: Add vanilla, then gradually mix in powdered sugar until smooth and fluffy. Add a pinch of salt.

Add Color: Divide the frosting into two parts and color one pink and the other blue.

Core the Cupcakes: Hollow out the center of each cupcake.

Fill with Frosting: Pipe the colored frosting into the center of each cupcake.

Replace the Tops: Put the cupcake tops back on to cover the frosting.

Pipe swirls or rosettes of white frosting on top of each cupcake. Add sprinkles or edible decorations for a festive touch.