Combine all ingredients in a large mixing bowl. Pour into lightly greased muffin tins or large casserole dish (9×13). Place in freezer to freeze throughout prior to serving. When ready to serve, allow to stand for about 3-5 minutes.: The bowl will fill with the aromatic scent of sweetened condensed milk and bright fruit, and you will notice a glossy sheen forming as the cherry pie filling and the drained crushed pineapple mingle. Use a roomy bowl so you can fold without splattering. As you combine, aim for an even distribution of fruit and cream without deflating the whipped topping. A common mistake is to mix too vigorously, which can collapse the air in the Cool Whip and yield a dense texture rather than a light, creamy finish. Pay attention to the visual cue of streaks blending into a uniform pale pink or peach color, which signals that the components are harmonized.
Pour into lightly greased muffin tins or large casserole dish 9×13: As you transfer the mixture, listen for the soft, thick plop as it settles into the pan, and notice how it levels out to a smooth surface. Greasing helps the frozen salad release cleanly later, whether you choose individual portions in muffin tins or a communal slab in a 9×13 casserole dish. Spoon or pour slowly to avoid trapping air pockets and to keep fruit evenly distributed. A typical error is overcrowding muffin tins which makes unmolding difficult; leave a little headspace for expansion when freezing.
Place in freezer to freeze throughout prior to serving: The freezer will transform the creamy mixture into a firm, sliceable dessert, and you might hear the faint click of the freezer as it works. Freezing throughout allows flavors to marry and the texture to set consistently. For best results, place the pan flat so the surface freezes evenly, and give it several hours or overnight. If you rush this step and the center remains soft, portions can collapse when sliced. Check for a uniformly solid surface and firm edges to know it is fully set.
When ready to serve allow to stand for about 3 to 5 minutes: After removing from the freezer, allow the dish to rest briefly so the edges soften just enough to make clean slices or scoops. You will notice the surface losing its icy sheen and becoming slightly glossy as it warms. This short standing time prevents cracking and helps plates avoid condensation rings. A common trap is leaving it too long at room temperature, which results in a melty, soupy texture rather than the delightful, chilled creaminess you want. Aim for that sweet spot where it is firm but yielding.
