Use a high-quality sugar-free chocolate sweetened with erythritol, monk fruit, or stevia to keep these bars strictly keto while still delivering deep cocoa flavor. Toasting the nuts and seeds in a dry skillet over medium heat for a few minutes before mixing adds extra flavor and crunch but let them cool fully before stirring into the chocolate so they do not cause it to seize. Adjust the sweetness gradually by tasting the melted chocolate mixture before adding the nuts, remembering that chilling slightly mutes sweetness. For nut-free bars, replace the almonds and walnuts or pecans with extra seeds and shredded coconut while keeping total quantities the same. Each bar is rich and satisfying, so cutting them smaller can reduce calories and net carbs if desired.