Heat the oil in a large nonstick skillet coated with cooking spray over medium heat. Add onion and bell pepper; sauté 4 minutes. Add mushroom caps, and sauté 5 minutes or until tender. Remove pan from heat. Stir in the vinegar, capers, salt, and black pepper.
Spread about 2 tablespoons cheese over each bread slice, and top each with 3 tomato slices and 2/3 cup mushroom mixture.
I forgot the tomatoes at the grocery store, and I didn't have any capers either but this recipe was DELICIOUS. Tangy goat cheese and salty red wine vinegar make for a great flavor combination. This is a great vegetarian option, and I would love to try it in the summer time when tomatoes are at their peak.
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