Place cashews in a bowl. Cover with water; let soak for at least 1 hour. Drain and rinse.
Transfer cashews to a blender; blend until finely chopped, scraping the sides of the bowl periodically. Add red bell pepper, onion, lemon juice, jalapeno pepper, and garlic; blend until well chopped. Scrape the sides of the bowl; add 3/4 cup water, nutritional yeast, paprika, turmeric, mustard, salt, and pepper. Blend until smooth, adding more water if necessary.
Combine cashew mixture and kale in a large bowl; scrunch kale with your hands until evenly coated with cashew mixture. Spread in a single layer on an unlined dehydrator tray.
Dehydrate kale at 105 degrees F (41 degrees C) until crisp, about 8 hours.