Combine the Wet Ingredients: In a large bowl, combine the maple syrup, peanut butter, vanilla extract, and salt. Stir until smooth and fully combined.
Stir in the Hemp Hearts: Add the hemp hearts and mix until evenly incorporated.
Fold in the Quinoa Puffs: Add the quinoa puffs and gently fold everything together until every puff is evenly coated. This takes a few minutes, so keep scraping the spoon around the bowl and folding until no dry quinoa puffs remain.
Press the Mixture into the Pan: Line an 8 × 8 inch (20 × 20 cm) baking tin with parchment paper. Transfer the mixture into the pan and press it down firmly using the back of a spoon or the bottom of a measuring cup. Compacting the mixture well helps the bars hold together after slicing.
Melt and Spread the Chocolate: Melt the dark chocolate chips in the microwave using 20-second intervals, stirring between each, or use a double boiler. Pour the melted chocolate over the top and spread it evenly right to the edges of the pan.
Refrigerate and Slice: Refrigerate for at least 4 hours, or until completely set. Before slicing, run a sharp knife under hot water and wipe it dry. This helps create clean slices through the chocolate layer.