Spinach is considered a superfood because it contains vitamins A, C, and K, as well as folate, potassium, calcium, and fiber. Serve with quesadillas for a simple, delicious meal.
Bring a large pot of water to a boil. Blanch the spinach until wilted, about 1 minute. Drain in a colander, let cool, and gently squeeze out all of the water. Set aside.
Heat the oil in a large skillet over medium heat. Sauté the onion until translucent, 5 to 6 minutes. Add the garlic and sauté for 1 more minute, until fragrant.