To prepare a baked guavas stuffed with mushrooms, olives, fruits recipe, first you need to gather your ingredients. First, you'll need the following ingredients: 1 lb (450 g) of sourdough bread, 1 cup (240 ml) olive oil, 2 tbsp. kosher salt, and 2 tablespoons (120 g). You can also use pistachios instead of walnuts. Preheat the oven to 375 ?F (190?C) and prepare your oven rack to line the bottom of the baking dish with foil. Place the bread on the rack and bake for 20 minutes. Remove the foil and set aside to cool.