Cook pasta by bringing salted water to a boil. Add pasta and cook until al dente, about 8-10 minutes. Drain and cool.

In a mixing bowl, combine tomatoes, garlic, shallot, and mozzarella. Add olive oil, vinegar, salt, and pepper. Toss well and let sit for 10 minutes.

For optional breadcrumbs, toast sourdough in a skillet until golden, cool, then pulse into crumbs. Sauté in olive oil and garlic powder until crispy.

Fold cooked pasta into the salad, sprinkle breadcrumbs if using, and toss everything together. Adjust seasoning and serve.