Prep your pan: Line a loaf pan or small square baking dish with parchment, leaving an overhang for easy lifting.
Melt the base: Add chocolate, coconut oil, and nut butter to a heatproof bowl. Microwave in 20–30 second bursts, stirring between each, until smooth. Alternatively, use a double boiler over low heat.
Whisk in cream and sweetener: Stir in heavy cream (or coconut milk) and powdered sweetener.
Mix until fully dissolved and glossy. Taste and adjust sweetness.
Add flavor boosters: Stir in vanilla and a pinch of salt. Fold in optional add-ins like nuts or coconut.
Pour and level: Scrape the mixture into the lined pan and smooth the top with a spatula.
Sprinkle with flaky sea salt if using.
Chill to set: Refrigerate for 60–90 minutes, or freeze for 20–30 minutes, until firm enough to slice.
Slice and enjoy: Lift out using the parchment and cut into small squares. A warm knife makes cleaner cuts.