Keep the garlic whole. Quickly rinse the button mushrooms under water and pat dry with a kitchen towel, then cut them in half.
In a pan, add olive oil and garlic. Cook on low heat for 3–4 minutes until the outside is golden and the inside is soft and tender.
Once the garlic is cooked, add the mushrooms. Stir-fry for 2–3 minutes until the moisture evaporates and the mushrooms become tender.
Right before turning off the heat, add a pinch of salt and a dash of pepper.