Line an 8-inch (20 cm) square pan with parchment paper, leaving overhang for easy lifting.
In a large bowl, whisk together the raw tahini paste, maple syrup, coconut oil, vanilla extract, and a pinch of salt until smooth and glossy.
Stir in the pistachios (or other nuts), chocolate chips (if using), and desiccated coconut (if using) until evenly combined.
Pour the mixture into the lined pan and smooth the top. Tap the pan gently to level the mixture.
Chill until firm (about 2 hours), then lift out and cut into squares.