Season chicken with Cajun seasoning and sear in hot oil until cooked through; set aside and chop.
In the same pan melt butter, cook garlic, then add heavy cream.
Season the cream sauce with Cajun seasoning, Italian herbs, salt, and pepper; simmer until slightly thickened.
Boil lasagna noodles until al dente; drain and lay flat.
Spread ricotta in the bottom of a baking dish, add noodles, more ricotta, chicken, sauce, and mozzarella.
Repeat layers, ending with sauce and remaining cheese on top.
Sprinkle extra Cajun seasoning and herbs over the top.
Bake at 375°F until bubbly and golden, about 30-35 minutes.
Rest 10 minutes before slicing and serving.
Tip: Do not overcook the noodles so they hold their shape during baking.