Heat the olive oil in a skillet over medium heat until shimmering and the oil begins to ripple.
Add the sliced mushrooms to the pan. Cook, stirring occasionally, until they release their moisture and turn golden brown, about 5-6 minutes. You should hear a gentle sizzle and see the mushrooms shrink slightly.
Stir in the minced garlic and cook for about 30 seconds until fragrant and lightly toasted, filling the kitchen with a warm aroma.
Add the fresh spinach to the skillet. Use a spatula to gently fold the greens into the mushrooms, allowing them to wilt and reduce in volume, about 2-3 minutes. You'll notice the spinach turning a bright green and softening.
Season with salt and pepper to taste, sprinkling evenly across the mixture, then toss to combine everything well.
Cook for another minute to allow the flavors to meld and the ingredients to reach your preferred tenderness. The mushrooms should be caramelized, and the spinach fully wilted.
Remove from heat and transfer to a serving dish. Serve immediately for the best flavor and texture.
