Margherita Pizza Beans

Name: Margherita Pizza Beans
Ingredients: 1 lb. large ripe tomatoes; 2 15-oz. cans white beans (such as cannellini or butter), rinsed; Kosher salt, freshly ground pepper; 3 Tbsp. extra-virgin olive oil, plus more for drizzling; 2 pints cherry or Sun Gold tomatoes (about 1¼ lb.); 4 garlic cloves, finely chopped; ¼ cup torn basil leaves, stems reserved, plus more for serving; 6 oz. fresh mozzarella, thinly sliced; 2 Tbsp. finely grated Parmesan, plus more for serving; Toasted country-style bread (for serving)