Bring a large pot of salted water to a boil.
Add the ziti pasta and cook according to the package instructions until al dente.
Once cooked, drain the pasta and set it aside.
Place olive oil in a large sauté pan over medium-high heat.
Allow the oil to heat until it begins to shimmer.
Add the ground Italian sausage to the pan.
Cook while stirring occasionally until the sausage is fully browned and no longer pink.
Add the minced garlic to the pan with the sausage.
Cook for about 30 seconds, stirring constantly to prevent burning.
Add the following ingredients to the pan:
Diced tomatoes
Marinara sauce
Butter
Chopped basil
Stir everything together until the mixture becomes smooth and well combined.
Remove the skillet from the heat.
Add the cooked ziti pasta to the sauce mixture.
Then mix in half of the mozzarella cheese.
Stir until the pasta is evenly coated.
Pour the pasta mixture into a baking dish.
Spread it evenly across the dish.
Sprinkle the remaining mozzarella cheese and Parmesan cheese over the top.
Place the dish under the broiler or in a convection oven for 2 to 3 minutes.
Cook until the cheese melts and becomes golden and bubbly.
Remove the baked ziti from the oven.
Garnish with a fresh basil sprig.
Serve immediately while hot and cheesy.