Makes 2 dozen
Preheat the broiler. Slice a baguette into 24 slices. Broil on a rimmed baking sheet until golden, 3 minutes. In a skillet, heat 2 tablespoons extra-virgin olive oil over medium heat. Cook 1 thinly sliced onion and 1 chopped garlic clove, stirring, for 5 minutes. Add 1 pound thinly sliced cremini mushrooms and 1 tablespoon chopped fresh thyme and cook until the mushrooms are soft, 10 to 12 minutes; season with salt and pepper. Top the toasts with the mushrooms and ¼ pound.