i had some kale so i made both together at the same time.
for the kale chips you need
salt i used pink Himalayan salt but any salt is fine
in a bowl add the kale and pour in enough oil to lightly coat it (about 1 tbsp) then sprinkle over the salt,
place spread out on a baking tray lined with baking paper.
bake in a low oven about 70c to 100c for 1 hour, turn over and cook for another hour
for the beet chips
slice the beets using a mandolin so they are thin
place them spread out on a baking tray lined with paper and bake at the same temperature as the kale chips, they will need a little longer than the kale to dry them out and make them crispy so keep turning them for a further 20 minutes removing the ones which feel done as you go.
i kept the beet chips plain but you can season then with salt, vinegar if you want.