Prepare the pan: Line an 8x8-inch square pan with parchment paper, leaving overhang on two sides for easy lifting.
Make the base: In a mixing bowl, combine peanut butter, protein powder, almond flour, sweetener, vanilla, and salt. Stir until thick and uniform. Add almond milk a little at a time until a soft, doughy mixture forms that holds together but isn’t sticky.
Adjust texture: If the mixture is crumbly, add 1–2 teaspoons more almond milk.
If it’s too wet, add a tablespoon of almond flour or protein powder.
Fold in extras: If using chopped peanuts, chia, or flax, fold them in now for crunch and extra fiber.
Press into pan: Transfer the base mixture to the lined pan. Press firmly into an even layer using a spatula or your hands. Smooth the surface.
Melt the chocolate: In a microwave-safe bowl, combine chocolate chips and coconut oil.
Microwave in 20–30 second bursts, stirring between each, until smooth. Alternatively, melt gently on the stovetop.
Add the topping: Pour the melted chocolate over the peanut butter layer. Tilt the pan or use a spatula to spread it evenly.
Chill to set: Refrigerate for 45–60 minutes, or until the chocolate is firm and the base is set.
Slice cleanly: Lift the slab out using the parchment.
Warm a sharp knife under hot water, dry it, and cut into 12–16 bars. Wipe and re-warm the knife between cuts for neat edges.
Serve or store: Enjoy chilled for a firmer bite or at room temperature for a softer, fudgier texture.