Wipe each mushroom with a dry paper towel to remove any dirt. Do not rinse with water. Leave small mushrooms whole and halve or quarter any larger ones.
In a large skillet over medium to medium-high heat, melt the butter until foaming.
Add the mushrooms in a single layer and let them sit undisturbed for 2 to 3 minutes until a golden crust forms on the bottom. Then stir and continue cooking.
Add the Worcestershire sauce, Creole seasoning, herbs de Provence, salt, pepper, and fresh thyme sprigs. Stir to coat evenly.
Cook for another 3 to 5 minutes, stirring occasionally, until the mushrooms are deeply golden, tender, and glossy. Remove thyme sprigs before serving.