Pre-heat oven to 200ºC.
Thinly grate the vegetables using either a grater, mandolin or slicer in a food processor.
Mix the lighter coloured vegetables together; potato, parsnip and courgette, then in a separate bowl the darker vegetables; carrots and beetroot.
Drizzle a little rapeseed oil over the vegetables, then add 1 teaspoon of each of the spices to both bowls. Toss until fully coated.
Lay the vegetables out on baking trays lined with parchment paper. You may have to do this in batches as there are a lot of veggies when sliced. Bake for 15-20 minutes until crispy and browned slightly around the edges. After 15 minutes watch them closely as they burn quickly!
Finely chop the tomatoes, season with pepper then add the lime juice.
Mash the beans with a little garlic powder and heat until warmed through.
Serve nachos with the chopped tomatoes, a dollop of sour cream, mashed avocado, spring onions and a generous sprinkle of finely chopped coriander leaves.