Inside out Lasagna

Method

1. Bring a large pot of water to a boil. Add pasta; cook until just tender, approx 8 to 10 minutes. Drain and transfer to a large bowl.
2. Meanwhile, heat oil in a large non-stick skillet over medium heat. Add onion and garlic and cook, stirring, until soft and beginning to brown, about 3 minutes. Add mushrooms, salt and pepper and cook, stirring, until the mushrooms release their liquid, 4 to 6 minutes.
3. Add tomatoes and spinach. Increase heat to medium-high; cook, stirring once halfway through, until the spinach is wilted, about 4 minutes.
4. Toss the sauce with the pasta and divide among 4 bowls. Top each serving with 3 tablespoons of ricotta.