Heat oven to 180C/360F and arrange a baking tray into the middle shelf.
Cook the pasta in a large pot of lightly salted boiling water. Cook the pasta until just al dente, about 4 min shorter than cooking time instructions.
Drain pasta, and mix it with the marinara sauce, tomatoes, half the mozzarella, basil and olive oil. Toss all ingredients together, season accordingly, then spoon evenly into a large ovenproof dish.
Top the pasta with remaining mozzarella. Place in the oven and cook until cheese is melted, about 15 minutes.
Top with the remaining basil and serve immediately.
Notes
Store leftovers of this caprese pasta bake in an airtight container in the fridge for up to two days.