Cut: Unwrap each Rice Krispies Treat carefully. Using a sharp serrated knife, cut each one horizontally through the middle. A serrated knife glides through the marshmallow without squishing it, keeping your layers tidy and beautiful.
Warm: Empty the can of apple pie filling into a small saucepan. Warm it over medium-low heat for 2–3 minutes, stirring occasionally, just until it's loose and glossy. You can also microwave it in 30-second bursts. You're looking for it to be steamy, not bubbling hot.
Spoon: Place the bottom halves of the Rice Krispies Treats on your serving board. Spoon a generous spoonful of warm apple pie filling onto each one. Let the filling come all the way to the edges, but don't drown it — two or three apple chunks per treat is the sweet spot.
Top: Place the top half of the Rice Krispies Treat back on. Don't press down — just let it rest gently on top of the apples. Pressing will squeeze the filling out the sides.
Garnish: Add a generous dollop of whipped topping. Use a fine-mesh sieve or a small spoon to dust cinnamon over the top. Drizzle with warm caramel sauce in a back-and-forth motion for that gorgeous bakery look.
Serve: Serve immediately while the apples are still warm and the Rice Krispies Treats are firm. The contrast in textures — the crunch of the marshmallow treat, the soft warmth of the apples, the cool creaminess of the topping — is everything.