Preheat oven to 450 degrees.
While the oven is preheating, cut the zucchini into 1/4u0022 slices, peel and slice the garlic, and cut shallots into wedges. Toss all veggies with 1 tbsp olive oil, along with 1/4 tsp salt and pepper. Cover with foil and let the veggies sit in the fridge for at least 30 minutes. *(see note)
Put the sheet pan in the now-hot oven and let it preheat for at least 30 minutes.
Trim chicken breasts. Pat dry, then rub with 1/2 tsp salt and pepper, and 1 tsp herbs de provence.
After the sheet pan is preheated, brush it with the remaining 1 tbsp olive oil.
Working quickly, add chicken to center of the pan (you should hear a sizzle). Arrange vegetable mixture around the chicken. Bake at 450 for 10 minutes.
Flip chicken. Spoon 1/2 cup fire roasted tomatoes around the veggies and stir. Cook for another 10 minutes.
Place fresh mozzarella pearls around the sheet pan, and some on the chicken (break the pearls up to flatten them on the chicken in needed). Continue to cook until softened and melted to your liking, about 5-6 minutes. Check the internal temp of the chicken and make sure it is 165 degrees.
If desired, you can finish it off with a broil (turn up the heat to 500 degrees) for 1-2 minutes. Just be careful not to burn the vegetables.
Serve immediately with fresh basil, oregano, and parmesan!