Make the lemon ricotta by mixing ricotta, zest of one lemon, and lemon juice in a small bowl. Add salt, black pepper, and red pepper flakes (if using). Set aside.
Boil a large pot of salted water and cook spaghetti according to package instructions until al dente. Reserve 1¼ cups of pasta water, then drain.
In a large skillet, heat olive oil over medium heat. Sauté onion and garlic for 2-3 minutes until fragrant.
Season chicken breasts with kosher salt, black pepper, and oregano. Cut them in half horizontally for even cooking. Add chicken to the skillet and cook for 5 minutes without disturbing.
Flip the chicken, add the zest and juice of one lemon, and cook for another 5 minutes until the internal temperature reaches 160°F. Remove chicken and cover with foil.
Reduce heat to low, add spinach to the skillet, and stir until wilted.
Add spaghetti to the skillet with spinach, along with the ricotta mixture. Toss to combine, adding reserved pasta water to reach desired consistency.
Slice the chicken and return it to the skillet. Toss everything to coat evenly.
Serve hot, garnished with additional lemon zest if desired.
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Notes
This dish is best enjoyed fresh but can be stored in an airtight container in the refrigerator for up to 3 days. Reheat gently to preserve texture.