Preheat oven to 350°. Prepare pasta according to package directions.
Sauté onion and fennel bulb in hot oil in a Dutch oven over medium heat 8 to 10 minutes or until tender. Add garlic and fennel seeds, and sauté 1 minute. Stir in marinara sauce and next 6 ingredients; increase heat to medium-high, and bring to a boil. Reduce heat to medium-low; cover and simmer 10 minutes. Remove from heat, and stir in basil, cooked pasta, and salt to taste. Transfer to a lightly greased 13- x 9-inch baking dish. Place dish on an aluminum foil-lined baking sheet. Top with cheese.
Bake at 350° for 25 minutes or until bubbly.
Note: We tested with Classico Marinara with Plum Tomatoes.
I just made this for my family. My 18 year old had seconds. My 5 year old asked for more too. The fresh basil makes this dish. Lots of flavor for jarred marinara sauce. I will definitely add this to my repertoire.