01 - Wash the greens thoroughly and drain well.
02 - Heat olive oil in a large skillet over medium heat. Add sliced garlic and sauté for 1 minute, stirring frequently, until fragrant but not browned.
03 - Add the greens to the skillet, tossing to coat with oil and garlic. Cook for 4 to 6 minutes, stirring often, until wilted and tender but still bright green.
04 - Season with salt, pepper, and red pepper flakes if using. Stir in lemon zest and juice, toss to combine, and cook for 1 additional minute.
05 - Taste and adjust seasoning as needed. Transfer to a serving dish and sprinkle with toasted nuts if desired. Serve warm.