Preheat your oven to 175°C (350°F) and line a baking sheet with parchment paper.
Wash the kale thoroughly and dry it completely—use a salad spinner or pat dry. Remove the tough stems and tear the leaves into bite-sized pieces.
Place the torn kale into a large mixing bowl. Drizzle with a tablespoon of olive oil and toss gently to evenly coat each leaf; you should see a slight sheen.
Sprinkle the sea salt evenly over the leaves, feeling the coarse grains with your fingers for a generous coating. Add optional spices like paprika, garlic powder, nutritional yeast, or lemon zest if using, then toss again for flavor distribution.
Arrange the kale leaves in a single layer on the prepared baking sheet, avoiding overlapping to ensure they crisp evenly.
Bake in the preheated oven for 10-15 minutes, checking at the 8-minute mark. The edges should turn golden and crispy, and the leaves will emit a nutty, roasted aroma.
Once crispy and fragrant, remove the baking sheet from the oven and let the chips rest for a couple of minutes to firm up.
Transfer the kale chips to a wire rack or plate and serve immediately for the best crunch. Store any leftovers in an airtight container once cooled.