Prepare the Dressing: Start by adding all of the dressing ingredients—spinach, basil, dill, nutritional yeast, garlic, avocado, lemon juice, white grape juice vinegar, salt, and pepper—into a small blender or food processor. Blend until completely smooth and set aside to let the flavors meld together.
Mash Chickpeas: In a large mixing bowl, add your rinsed and drained chickpeas. Using a fork or potato masher, lightly mash them until they're mostly broken down but still have some texture remaining according to your preference.
Combine Vegetables: To the mashed chickpeas, add cabbage, red onion, cucumber, jalapeño pepper along with a pinch of salt and pepper for seasoning. Toss everything together until evenly mixed.
Dress the Mixture: Pour the prepared creamy dressing over the chickpea mixture and toss gently until all components are thoroughly coated in the dressing.
Assemble Your Sandwiches: Begin assembling by spreading hummus on one slice of bread and Dijon mustard on another slice for added flavor complexity. If desired, add extra spinach on top of the hummus before layering on generous amounts of your green goddess salad mixture.