Recipe: Stuffed Peppers with Quinoa Ingredients 10 large organic bell peppers (red, orange, yellow, green), tops cut off and seeds removed 2 large onions, sliced 3 carrots, chopped 2 celery stalks, chopped 1 cup bell peppers, chopped 4 cups broccoli florets 8 ounces button mushrooms, chopped 1 pk. dried organic mushroom medley, chopped 2 cups