1. In large pot of boiling salted water, cook pasta for 8 to 10 minutes or until tender but firm. Drain and return to pot, reserving 1/2 cup (125 mL) of the cooking liquid.
2. Meanwhile, cut chicken breasts crosswise into slices. In nonstick skillet, melt butter over medium-high heat; brown chicken, stirring occasionally, about 5 minutes. Add garlic; cook, stirring, for 1 minute.
3. Add reserved cooking liquid, ricotta cheese, half of the Parmesan cheese, the lemon rind and juice, salt, pepper and nutmeg; bring to simmer.
4. Add spinach; stir until wilted. Add to pasta and toss to coat. Serve sprinkled with remaining Parmesan cheese.
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