Preheat your oven to 400°F and line a baking sheet with parchment paper.
Wash and dry your sweet potatoes. Then, pierce each potato 5 times with a fork, place them on the prepared baking sheet, and spray with a little olive oil. Bake for 40 - 65 minutes or until they are fork-tender.
With 15 minutes to go, heat a large saute pan with olive oil over medium. (*if using raw chicken breast, read notes below*) Add onions and cherry tomatoes and saute for 4 – 5 minutes until soft and caramelized. Add in minced garlic and cook for an additional 30 seconds until fragrant.
Add the marinara sauce, salt, pepper, Italian season, basil, and cooked shredded chicken. Stir and let simmer for about 3 - 4 minutes until everything is warm.
Remove from heat and stir in the freshly grated parmesan and ¼ cup of mozzarella cheese. Carefully taste and adjust seasonings to your preference.
Once sweet potatoes are done baking, let them cool for 5 - 10 minutes until you can touch them without burning yourself. Cut the sweet potatoes open length-wise (don’t cut all the way to the bottom!). Then, use a fork, open the split and lightly fluff the insides to make space for toppings.
Fill each sweet potato with the chicken parm mixture and evenly sprinkle the rest of the shredded mozzarella on top.
Place them back in the oven for 5 minutes until the cheese is melted.
Top with fresh basil, and enjoy!