Prep the pan: Line an 8x8-inch pan with parchment, leaving overhang so you can lift the bars out later.
Melt the chocolate: Add the chocolate and cocoa butter (or coconut oil) to a heatproof bowl. Gently melt over a saucepan of simmering water (double-boiler style), stirring until smooth.
Or microwave in 20–30 second bursts, stirring between each.
Stir in nut butter: Whisk in almond or peanut butter until glossy and fully combined.
Add flavor and sweetener: Mix in vanilla, salt, and your sweetener. Taste the mixture. If you prefer sweeter, add another tablespoon and whisk again.
Fold in the crunch: Add the keto crispies and nuts.
If using optional add-ins like cacao nibs or hemp seeds, fold them in now. The mixture should be thick but scoopable.
Spread and level: Scrape the mixture into the lined pan. Use a spatula to press it into an even layer.
For extra flair, sprinkle a pinch of flaky salt on top.
Chill: Refrigerate for 1–2 hours, or until firm enough to slice cleanly. For faster set, pop into the freezer for 25–35 minutes.
Slice and serve: Lift out using the parchment. Cut into 16 small squares or 12 larger bars with a sharp knife.
Wipe the knife between cuts for neat edges.