Heat the oil in a skillet and add the garlic and red pepper flakes (if using). Cook over medium heat for 1 minute or until the garlic just begins to brown, stirring frequently.
Add the kale in batches, stirring after each addition. Cook until slightly wilted.
Season with salt and pepper, stir and cook over medium heat for about 5 minutes or until the kale is just tender.
Serve immediately or keep leftovers in an airtight container in the fridge for 4-5 days.
Notes
Kale contains many powerful antioxidants, including quercetin and kaempferol. These have heart-protective, blood pressure-lowering, and anti-inflammatory properties!