Cook garlic until it begins to sizzle and turn golden brown, 5–7 minutes
Using a slotted spoon, transfer to bowl with dressing
Increase heat to medium-high, add eggplant and 1 cup tomatoes, and cook, stirring occasionally, until eggplant is browned and cooked through and tomatoes begin to burst, about 6–8 minutes
Season with remaining 1/4 tsp
salt and transfer to bowl with dressing
Cut remaining 1 cup tomatoes in half lengthwise and add to bowl with dressing
Add zucchini and squash; gently toss to combine
Add 3 Tbsp
olives and 2 Tbsp
basil, then transfer with tongs to a platter, letting extra liquid drain and remain in bowl
Lay mozzarella on 1 end of platter and drizzle with oil