Heat a large nonstick skillet with high sides over medium heat and lightly mist with olive oil spray.
Working in two batches, add the drained artichoke hearts and cook until dark golden, about 3–4 minutes per batch; transfer to a plate.
Season the chicken tenders with 1/2 teaspoon salt and 1/4 teaspoon black pepper.
Spray the pan with more oil and cook the chicken 5 minutes, turning halfway, until cooked through; transfer to a plate and set aside.
Add a little more spray if needed, then add the chopped onion, chopped garlic, and 2 teaspoons chopped oregano and cook, stirring, until the onion is softened and golden, about 4 minutes.
Stir in the sun‑dried tomatoes and chopped kale, then sprinkle with 1 teaspoon salt and 1/2 teaspoon black pepper.
Add 2 tablespoons lemon juice and 2 1/4 cups water, stir in the cavatappi, cover the pan, and cook for 10 minutes.
Cut the cooked chicken into 1‑inch pieces while the pasta cooks.
Remove the cover, stir in the chopped chicken and reserved artichokes, reduce heat to medium‑low, cover, and cook 5 more minutes until the pasta is al dente and the chicken is heated through.
Uncover and simmer briefly to evaporate any excess liquid if necessary, then serve topped with shaved parmesan (if using), remaining oregano, and more salt and pepper to taste.