2. Using a small spoon, scrape out the black gills on the undersides of the mushroom caps. Cut the caps in half and then slice crosswise.
3. In a skillet over medium-high heat, heat the olive oil. Cook the mushrooms, salt, and pepper, stirring often, for 5 minutes or until the mushrooms release their liquid and the liquid evaporates. Stir in the garlic and thyme; cook 1 minute more. Cool to room temperature.
4. In a small bowl, mix together the goat cheese, olives, capers, mushrooms, and red pepper. Divide the mixture among 4 slices of bread. Top with spinach and cover with the remaining bread. Brush olive oil on the top bread slices.
5. Heat a heavy skillet over medium heat. Place sandwiches in the skillet, oiled sides down. Top with a large, heavy pot. Cook for 3 to 4 minutes or until the bottoms are golden. Sprinkle the top bread slices with oil. Turn the sandwiches, replace the pot, and continue cooking for 2 to 3 minutes or until the bottoms are golden. Cut the sandwiches in half on a diagonal.
Adapted from “In a Cheesemaker’s Kitchen’’