Preheat the oven to 350°F (175°C) and line a baking sheet with parchment paper. Measure out the chocolate chips and roasted almonds.
In a saucepan over low heat, melt the butter and chocolate chips together, stirring constantly until smooth and glossy. Remove from heat and set aside to cool slightly, releasing a rich chocolate aroma.
1 cup dark chocolate chips
In a large mixing bowl, whisk the eggs and sugar until the mixture is pale and slightly frothy, about 2 minutes. Add the melted chocolate mixture and stir until well combined.
1 cup dark chocolate chips
Gradually fold in the flour until just combined, then gently mix in the chopped almonds, marshmallow fluff, and the remaining chocolate chips. The dough will be thick and sticky but spreadable.
1 cup dark chocolate chips
Scoop spoonfuls of dough onto the prepared baking sheet, evenly spaced. Flatten slightly with the back of the spoon or your fingers to encourage spreading.
Bake for 10 minutes, or until the edges are golden brown and the centers are gooey. The cookies will look rustic, uneven, and tempting with melted chunks and crunchy nuts visible.