Preheat Oven:Set your oven to 500°F to prepare for broiling.
Cook Aromatics:Heat olive oil in a large oven-safe skillet over medium heat. Add the diced onion and sauté for about 5 minutes until softened. Stir in chopped garlic and cook for an additional minute.
Brown the Chicken:Add ground chicken to the skillet. Break it apart with a spoon and cook until fully browned and cooked through. Drain any excess liquid if necessary.
Season and Simmer:Sprinkle in salt, oregano, basil, and parsley. Stir well. Add tomato sauce and balsamic vinegar, mixing to combine everything evenly.
Add Toppings:Scatter mozzarella pearls and halved cherry tomatoes across the top of the ground chicken mixture.
Bake Until Bubbling:Transfer the skillet to the preheated oven. Bake for 7–8 minutes until the cheese is melted and the tomatoes are blistered.
Finish and Serve:Remove from oven and top with freshly chopped basil, a generous drizzle of balsamic glaze, and grated parmesan. Serve hot straight from the skillet or over pasta, rice, or toasted bread.