Stir in the sweetened condensed milk and lemon juice until well combined.
Add ice to a glass.
Pour the lemonade mixture over the ice and garnish with a lemon slice to serve.
Notes
This recipe is fairly creamy due to using a full can of sweetened condensed milk. If you would prefer it to be less creamy you can use 1/4 cup of sweetened condensed milk and either a 1/2 cup of granulated sugar or 1/3 cup of simple syrup.
This tastes very similar to Chick-fil-A’s Frozen Lemonade. You could make this frozen by adding it to a blender with ice.
While freshly-squeezed lemon juice is preferred for the best taste, you can use bottled lemon juice in a pinch.
Serving a crowd? It's easy to double or triple this recipe!