Remove the pot from the heat, add the flour and stir until no white remains. Spray a medium gratin dish or pie plate with cooking spray or rub with butter. Check kale for seasoning and then transfer to the dish in an even layer. Sprinkle the butter over the top of the kale, sprinkle the parmesan cheese evenly over the top. Drizzle half and half over the kale and bake for 25-30 minutes or until cheese is browned. Serve warm.
Notes
Recipe adapted from Pike's Place Market Recipes
Recipe by Nutritious Eats at https://www.nutritiouseats.com/kale-and-bacon-gratin/