Assemble ingredients and equipment.
Brown the butter: In a small saucepan, cook the butter over medium-high heat until the milk solids turn golden and the butter smells nutty. Once browned (you should be left with just over 150g), immediately pour into a heatproof jug to stop the cooking. Set aside to cool slightly.
Mix the dry ingredients: In a large mixing bowl, weigh in the almond flour and sugar. Place a fine mesh sieve over the bowl, then weigh in the cacao powder, cornstarch, and salt. Sift these directly into the almond flour mixture, then whisk everything together until evenly combined.
Whisk the egg whites: In a medium mixing bowl, lightly whisk the egg whites just enough to break them up and loosen their texture. You're not building volume—just making them easier to incorporate.
Combine: Whisk the egg whites into the dry ingredients in three additions to avoid lumps. Then whisk in the honey. (Weighing it directly into the bowl saves you scraping out a measuring cup.)
Add the beurre noisette: Gradually whisk in the browned butter. Take your time here to create a smooth, glossy batter with no oily separation.
Rest the batter: Put the batter in a sealed container and refrigerate for at least 3 hours, preferably overnight. This helps hydrate the almond flour, firm up the butter, and improves the rise and texture of the baked cakes.
Portion the batter: When ready to bake, preheat the oven to 170°C conventional (150°C fan-forced). Grease an 8-hole mini loaf pan, using any leftover brown butter. Use a #24 scoop or roughly ¼ cup to portion the batter evenly into the pan.
Pipe the jam: Transfer ¾ cup of low sugar raspberry jam into a medium piping bag or zip lock bag with the corner snipped off. Pipe a neat line of jam down the centre of each mini cake, stopping just short of the edges.
Bake: Bake for 30-35 minutes, or until the cakes are risen, the tops spring back when lightly pressed, and a skewer inserted at the edge (not through the jam) comes out clean.
Cool and serve: Let the cakes cool in the pan for 10 minutes before transferring to a wire rack. Serve slightly warm or at room temperature. For extra jammy flair, pipe a second swipe of jam across the top just before serving.