¾ cup part-skim ricotta cheese
½ tsp. crushed red pepper (optional)
8 cups baby spinach
1 14-ounce can diced tomatoes with Italian herbs
¼ tsp. freshly ground pepper
½ tsp. salt
8 oz. sliced white mushrooms (about 3½ cups)
3 cloves cloves garlic, sliced
1 onion, chopped
1 tbsp. extra-virgin olive oil
8 oz. whole-wheat rotini or fusilli