My Favorite Sautéed Mushrooms with Creamy Mashed Potatoes

Ingredients

• 1 lb (450 g) mixed mushrooms (button, cremini, shiitake), cleaned and sliced
• 2 tablespoons (30 ml) olive oil
• 2 tablespoons (28 g) unsalted butter
• 3 cloves garlic, minced
• 1 teaspoon (5 g) fresh thyme leaves (or ¼ teaspoon dried thyme)
• Salt, to taste
• Black pepper, to taste
• 2 lbs (900 g) Yukon Gold potatoes, peeled and cut into chunks
• ½ cup (120 ml) whole milk, warmed
• 4 tablespoons (56 g) unsalted butter, softened
• Optional: ¼ cup (30 g) grated Parmesan cheese for added flavor