Prepare the ingredients: sift together the almond flour and powdered sugar in a bowl. Beat the egg whites until stiff peaks form, then gradually add the granulated sugar until you have a glossy, stable meringue.
Gently fold the almond flour mixture into the meringue until the batter is smooth and homogenous. Be careful not to overmix, or the macarons will not rise properly.
Using a piping bag, pipe evenly sized circles onto a baking sheet lined with parchment paper. Let them rest for 30 minutes to allow a skin to form on the surface.
Bake the macarons in a preheated oven at 300°F (150°C) for 12-15 minutes, until they are lightly crisp on the outside and still soft on the inside.
For the filling, peel and slice the apple, then sauté it in a pan with the cinnamon until the apple softens and caramelizes. Stir in the heavy cream.
Melt the white chocolate over a double boiler, then mix it with the cinnamon apple mixture. Let it cool to allow the cream to thicken.
Once the cream has cooled and thickened, use a spoon or piping bag to fill one half of the macarons with the cinnamon-apple cream. Top with another macaron shell to form a sandwich.
Place the finished macarons on a serving dish and let them rest in the refrigerator for a few hours to allow the flavors to meld.
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