Prepare all the ingredients. Sift the almond flour and powdered sugar together in a bowl to remove any lumps.
Beat the egg whites until stiff peaks form, then gradually add the granulated sugar. The meringue should be firm and the peaks should hold their shape.
Gently fold the almond flour and powdered sugar mixture into the meringue. Be careful not to overmix, to keep it airy.
Transfer the batter to a piping bag and pipe small circles onto a baking sheet lined with parchment paper.
Let the macarons rest for 30 minutes to allow a skin to form before baking.
Meanwhile, preheat the oven to 300°F (150°C). Bake the macarons for 12-15 minutes, then let them cool completely on the baking sheet.
Prepare the caramel filling: combine the caramel sauce with the heavy cream and whip until light and fluffy.
Melt the milk chocolate and mix with the peanut butter until smooth and creamy.
Once the peanut butter chocolate filling is smooth, refrigerate for 10-15 minutes to firm up slightly.
Once the macarons have cooled, pipe the creamy caramel filling onto one half of the shells, then top with the other half.
Let the assembled macarons rest in the refrigerator for at least 1-2 hours to allow the flavors to meld.
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