Heat a large skillet over medium heat. Add the olive oil and let it warm for about 30 seconds.
Add the sliced mushrooms to the skillet. Sauté for 3-4 minutes, stirring occasionally, until they are golden brown and have released their moisture.
Once the mushrooms are browned, add the minced garlic. Sauté for an additional 1 minute, being careful not to let the garlic burn.
Add the sliced zucchini to the skillet, along with the salt and pepper. Cook for 5-7 minutes, stirring frequently, until the zucchini is tender but still has a slight crunch.
Remove the skillet from heat and stir in the chopped fresh parsley. Serve immediately as a side dish or over rice for a light meal.