Heat a tablespoon of olive oil in the skillet over medium heat until it shimmers and you can smell the fragrant aroma.
Add the minced garlic to the hot oil, sautéing for about 30 seconds until it becomes fragrant and slightly golden, with a gentle sizzling sound.
Pile the fresh spinach into the skillet gradually, stirring frequently. As the leaves wilt and release their moisture, they will reduce in volume, turning bright green and tender.
Once all the spinach has wilted and looks glossy, sprinkle the crumbled feta cheese evenly over the mixture. Let it sit for about 1-2 minutes, allowing the cheese to soften and meld slightly into the greens.
Stir gently to combine the feta into the spinach, ensuring the cheese distributes evenly and begins to melt slightly, creating a creamy texture in parts of the dish.
Remove the skillet from heat when the feta is just beginning to melt and the spinach is heated through, about 2 minutes.
Serve immediately in bowls or on plates, enjoying the tender greens and the salty, tangy feta as a satisfying side or light main.