Place the room temperature butter into a mixing bowl and beat it until smooth, creamy, and slightly fluffy.
Gradually add the sifted confectioners' sugar while mixing, allowing it to fully incorporate into the butter without forming lumps.
Pour in the vanilla extract and continue mixing until the flavor is evenly distributed throughout the frosting.
Add the milk and beat the mixture for a few minutes until it becomes light, airy, and smooth in texture.
Adjust the consistency by adding more sugar if you want a thicker frosting or a small amount of milk if you prefer it softer.
Add food coloring if desired and mix until the color is fully blended and uniform.
Use immediately to frost cakes or cupcakes, or store as needed following proper storage guidelines.
