Ingredients:

• 1 tablespoon extra virgin olive oil
• 1 small onion, 1/4-inch slices, sliced lengthwise
• 1 clove garlic, minced (1 teaspoon)
• 1 (14-ounce) can crushed tomatoes, undrained
• 1 cup sliced cremini or button mushrooms
• 3/4 cup green pimento-stuffed olives, coarsely chopped
• 1 tablespoon chopped fresh oregano or 1/2 teaspoon dried oregano, crushed
• 1/4 teaspoon salt
• 1/8 teaspoon freshly ground pepper
• 4 (6- to 8-ounce) tilapia fillets