In a large skillet, heat oil over medium heat.

When hot, add onion and cook for 2 minutes, stirring occasionally.

Add garlic and cook for another minute.

Add kale and stock and toss to combine. Put cover on and cook for about 2 1/2 minutes.

Remove top and cook until most of the liquid evaporates, 2-3 minutes. Toss occasionally.

Season with salt and pepper and serve hot.