Open the package of silken tofu and carefully remove the block. Transfer the block to a plate and cut it in half. Keep half on the plate and store the other half in an airtight container in the fridge for future use. Leave the tofu on the plate for 5-10 minutes to remove any excess water. Carefully hold onto the tofu and tilt the plate over the sink to drain the water off the plate.
While the tofu is draining, add plant-based milk and 1 teaspoon of the apple cider vinegar to a pint-sized mason jar. Stir and set aside.
Add the parsley, garlic powder, onion powder, chives, dill, white pepper, paprika and remaining 1/4 teaspoon salt to a small bowl and set aside.
Make the mayo base. Add the tofu to the blending cup that came with your immersion blender. If you are using a food processor or standard blender, add the tofu to the bowl or your food processor or to your blender. Add aquafaba, 2 teaspoons apple cider vinegar, lemon juice, 3/4 teaspoon salt and ground mustard. Use the immersion blender, food processor or blender to combine the ingredients. Blend until you've achieved your desired consistency, scraping down the sides as needed. See notes below for tips.
Add the homemade mayo to the the milk and apple cider vinegar mixture. Stir to combine.
Add the parsley, garlic powder, onion powder, chives, dill, white pepper, paprika and salt seasoning mixture. Stir to combine. Tightly cap the mason jar and shake a few times to further incorporate the ingredients. Refrigerate for at least 2 hours to infuse the flavors. It will also firm up while refrigerating.