Prepare the ingredients: combine the almond flour and powdered sugar in a bowl. Beat the egg whites until stiff peaks form, then gradually add the sugar until you have a glossy meringue.
Gradually fold the almond flour mixture and cinnamon into the meringue. Be careful not to overmix; the batter should be smooth and flowing, but not too runny.
Pipe small rounds of batter onto a baking sheet lined with parchment paper. Let them rest for 20-30 minutes, allowing a skin to form on the surface.
Bake in a preheated oven at 300°F (150°C) for 12-15 minutes, until the tops are slightly crisp, but the insides remain soft.
While the macarons are baking, prepare the rum buttercream: cream together the butter and brown sugar, then add the heavy cream and rum. Beat until the frosting is smooth and creamy.
Once the macarons have cooled, place a spoonful of buttercream on one macaron half, then top with another macaron half to form a sandwich.
Serve the macarons on a pretty plate and let the buttercream set slightly. Enjoy!
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