Wash and dry your kale. Cut out the stems and cut the kale into approximately 2 inch pieces.
In a skillet heat the olive oil and add the onions. Cook until they start to get translucent on medium heat.
Add the garlic and cook for 1 minutes and then lower the heat to medium/low.
Next, add the kale and keep tossing it in the skillet. Once the kale starts to get a rich green color you'll add salt and pepper and then you'll start adding some water (2-3 tablespoons at a time) and cover the skillet with a lid to allow the kale to steam a bit. Cook like this for another 2-3 minutes
Once the kale is tender and cooked through you'll add a splash of white wine vinegar and the cinnamon. Toss for another 1-2 minutes and serve!