Prepare the plum jam filling: Combine the plum jam and heavy cream in a bowl and set aside.
Sift the almond flour and powdered sugar into a bowl to remove any lumps.
In a separate bowl, beat the egg whites until stiff peaks form. Gradually add the granulated sugar, continuing to beat until the meringue is glossy and holds stiff peaks.
Gently fold the almond flour and powdered sugar mixture into the meringue. Be careful not to overmix; you want to maintain the airiness of the meringue.
Transfer the batter to a piping bag fitted with a round tip. Pipe small, even circles onto a baking sheet lined with parchment paper.
Let the macarons rest for 30 minutes to allow a skin to form on the surface before baking.
Preheat the oven to 300°F (150°C). Bake the macarons for 12-15 minutes, then let them cool completely on the baking sheet.
Melt the white chocolate, then stir in the plum jam and heavy cream mixture until smooth and creamy.
Once the filling is smooth, refrigerate it for 10-15 minutes to allow it to firm up slightly.
Once the macarons are cool, spoon the creamy plum jam filling onto one half of each macaron and top with the other half to create a sandwich.
Refrigerate the finished macarons for at least 1-2 hours to allow the flavors to meld together.
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