In a large skillet over medium heat, heat olive oil. Add onion and garlic, sauté 2–3 minutes. Stir in ground chicken and sausage (if using). Cook 3–4 minutes until browned. Add tomato sauce, stock, paste, and seasonings. Simmer for 15–20 minutes.
Bring a large pot of salted water to boil. Cook lasagna noodles until al dente. Drain and rinse with cold water.
Set oven to 350°F. Grease a 9×13-inch baking dish.
Spread 1/2 cup meat sauce in the bottom of the dish.
Layer 3 noodles, half the ricotta (or substitute), 1/3 meat sauce, 1/3 mozzarella, and 1/2 Parmesan.
Repeat layers.
Top with final noodles, remaining meat sauce, and mozzarella.
Cover with foil sprayed with nonstick spray. Bake for 1 hour. Uncover and bake an additional 10 minutes. Let rest for 10–15 minutes before slicing.