Pour 1 cup of chilled fresh lemonade into your blender, making sure it's cold to help achieve the perfect frosty consistency. The cold lemonade is essential for creating that signature thick, creamy texture that Chick-fil-A's version is known for.
Add 1.5 cups of vanilla soft serve ice cream directly into the blender with the lemonade. The soft serve should be slightly soft but not melted, so it blends smoothly without becoming too thin or watery.
If you prefer a sweeter drink, add 1 tablespoon of granulated sugar to the blender. This step is optional and depends on how sweet your lemonade already is and your personal taste preference.
Blend all ingredients on medium speed for 30-45 seconds, until the mixture becomes smooth and creamy with a thick, frosty appearance. Stop and check the consistency—it should look like a thick milkshake, not a thin smoothie.
If the mixture is too thick, add 2-3 tablespoons of additional chilled lemonade and blend for another 10-15 seconds. If it's too thin, add a small scoop of soft serve and blend briefly until you reach the desired consistency.
Pour the frosted lemonade into a tall glass immediately after blending to prevent separation. The drink should have a smooth, creamy texture throughout with a pale yellow color from the lemonade and vanilla swirl.
Serve immediately with a wide straw or spoon, as this drink is thick and creamy like a frozen beverage. Enjoy it right away while it's at its coldest and most refreshing state, just like you'd get at Chick-fil-A.
