Start by preheating the oven to 350°. Wash and prep the onion and tomatoes.
Toss the gnocchi, tomatoes, and onion with the olive oil, salt, and pepper. Make sure everything is lightly coated in the oil then evenly spread everything out across the baking sheet and place it in the oven.
Remove the baking sheet from the oven after 15 minutes, toss everything and add the mozzarella onto the pan on top of the gnocchi. Return to the oven for another 5-10 minutes or until everything is cooked through.
Remove the gnocchi from the oven and sprinkle one more handful of fresh basil on top before serving.
Notes
This gnocchi can be stored in the refrigerator in a closed container for 3-4 days.