In a large skillet with a lid, melt the butter on medium heat. Add in the minced garlic and cook for 1 minute. Reduce the heat to low and add the fresh spinach. Place the lid on the skillet and cook for 5 minutes.
While the spinach wilts create a slurry by mixing together the heavy cream and cornstarch.
Once the spinach has wilted add the cream mixture. Mix well and season with salt and pepper.