Start by lining your square pan with parchment paper, leaving some overhang for easy removal later.
In a microwave-safe bowl or on the stovetop, gently melt the coconut oil and almond butter together until they form a smooth mixture. Stir in the sugar-free maple syrup, vanilla extract, and a pinch of salt.
Gradually add the unsweetened cocoa powder, whisking continuously to avoid lumps. This will result in a thick, glossy fudge mixture.
If you want to add some texture, fold in chopped nuts or dark chocolate chips at this stage.
Pour the mixture into the prepared square pan and spread it evenly. Use a spatula to smooth the top.
Place the pan in the refrigerator for at least 2 hours or until the fudge has set completely.
Once set, remove the fudge by lifting it out using the parchment paper overhang. Cut it into bite-sized squares.