In a 4-quart Dutch oven cook garlic in hot oil for 15 seconds. Add mushrooms. Cook, stirring frequently, until mushrooms are tender. Stir in vegetable broth and beans; bring to boiling. Add orzo. Return to boiling; reduce heat. Simmer, covered, 15 minutes or until orzo is tender. Stir in cherry tomatoes, and 3 tablespoons of the oregano; heat through. Sprinkle with remaining oregano, feta, and pepper. Drizzle with olive oil. Makes 4 servings.