Use very small strawberry pieces; larger chunks can freeze into hard, icy bits that detract from the creamy texture of the frozen strawberry fluff recipe. Fold the whipped topping rather than using a high-speed mixer, as too much air can cause the dessert to deflate or separate during freezing. Add a pinch of salt to the base mixture to balance the extreme sweetness of the condensed milk, which enhances the character of the frozen strawberry fluff recipe. Line your container with parchment paper to make it easier to lift out the frozen block for slicing beautiful squares when serving guests. Consider adding a splash of pure vanilla extract to deepen the flavor profile, adding a warm note that complements the brightness of the strawberries.