Line an 8-inch square baking pan with parchment paper and set aside.
In a large bowl, whisk together the tahini, maple syrup, vanilla and salt until smooth. Set aside.
Place the oats in a large frying pan over low heat and toast them until they're beginning to turn golden and start to become fragrant, 8-12 minutes, stirring frequently. Pour the oats into the bowl with the tahini mixture.
Wipe out the skillet and add the sesame seeds and chopped walnuts, toasting over low heat and stirring frequently until golden and fragrant, 4-6 minutes. Add the nuts and seeds to the bowl with the oats, then add the hemp seeds and cacao nibs. Use a silicone spatula to integrate the mixture until well combined.
Transfer the mixture to the parchment-lined pan and use damp hands to press into an even layer. Then use the bottom of a measuring cup to flatten and tamp down the mixture completely, passing it over the top of the bars.