Heat oil in a large cast iron pan on medium heat. Add turkey to pan and cook until it starts to brown and reaches an internal temperature of 165ºF (75ºC), breaking it up as you go.
Reduce heat to medium-low and add onion and carrot and cook for 2-3 minutes. Stir in marinara sauce and let simmer until reduced (~10 minutes). Remove from heat.
While the sauce is cooking, cook pasta according to package instructions and preheat oven to 350°F (177ºC).
Transfer pasta to pan and stir into sauce until combined. Add ricotta by the spoonful throughout and sprinkle mozzarella across the top.
Bake for 25-30 minutes until the cheese has melted. Transfer to serving bowls, top with fresh herbs and enjoy!