Preheat oven to 400 degrees.
Bring a large pot of salted water to a boil, add the kale and cook for 2 minutes. Drain and pat excess water with a paper towel. Set aside.
Heat the olive oil over medium high heat and add the onion. Cook for 5 minutes until the onion is soft. Sprinkle the flour over the onion, stir well and cook for 1 minute. Slowly whisk in the cream, stirring constantly to dissolve the flour. Add the chicken stock and garlic powder. Add the chicken, kale and chopped artichoke hearts. Simmer for a few minutes and adjust salt and pepper to taste.
Add 1 cup of the asiago cheese and stir to combine. ;Add to a buttered casserole dish and top with parmesan cheese and then the panko crumbs. Cook in the oven until bubbly and the panko turns golden brown, about 15 minutes. Enjoy!