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, ensuring the batter is homogenous and smooth. Be careful not to overmix, or the macarons won't rise properly.
Using a piping bag, pipe even 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 slightly crisp on the outside and still soft on the inside.
For the filling, heat the heavy cream and pour it over the finely chopped dark chocolate. Stir until completely melted, then add the butter and let it cool.
Add the blackberry liqueur to the cooling chocolate cream to create a pleasant fruity, liqueur flavor.
Once the chocolate cream has thickened, use a spoon or piping bag to fill one half of the macarons with the cream, and top with another macaron shell to form a sandwich.
Place the finished macarons on a platter and let them rest in the refrigerator for a few hours to allow the flavors to meld together.
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