Preheat the oven to 425 degrees F. In a small bowl, combine the beans, garlic, broth and cilantro. Using a fork, crush the beans slightly and set aside. In a blender or using an immersion blender, blend the goat cheese and cottage cheese until smooth. Season with salt and pepper and set aside. Spread half of the bean mixture over each tortilla and top with half of the cheese mixture. Sprinkle each tortilla with spinach, onion and salsa. Place one tortilla on a baking sheet and position the other on top of it. Sprinkle with mozzarella and bake for about 12 minutes, or until bubbling and heated through. Serve immediately.