Heat the olive oil in a large skillet with a lid over medium heat. Once hot, add in the mushrooms, salt and pepper. Stir to coat the mushrooms in oil and place the lid on the pot. Cook, stirring occasionally until the mushrooms have released their liquid, about 7-8 minutes.
1 tbsp olive oil, 1 lb. cremini or button mushrooms, ¼ tsp salt, ¼ tsp pepper
Remove the lid and add the butter, thyme, and garlic. Continue to cook, stirring occasionally until the mushrooms are golden brown, about 10-12 minutes.
2 tbsp butter, 1 tsp fresh thyme leaves, 1 medium garlic clove
Stir in the balsamic vinegar and water, scraping up any brown bits from the bottom of the pan. Cook for 1 minute until the liquid has evaporated.
½ tbsp balsamic vinegar, 1 tbsp water
Serve hot and enjoy.