Step 1

In a large cast-iron skillet, heat 2 tablespoons of the olive oil. Add the bread and toast over moderately high heat, turning once, until golden and crisp on both sides, 3 minutes. Transfer the toasts to a platter.

Step 2

Add 2 tablespoons of the olive oil to the skillet along with the onion and garlic and cook over moderately high heat, stirring, until golden, about 2 minutes. Add the remaining 2 tablespoons of olive oil and the mushrooms and season with salt and pepper. Cook, stirring frequently, until the mushrooms are well browned, 7 to 8 minutes. Stir in the wine and cook until evaporated, 1 minute. Stir in the parsley and thyme. Top the toasts with the mushrooms and serve.