Step 1

Preheat oven to 400 degrees F. Coat an 8-by-8- or 7-by-10-inch baking dish with cooking spray.

Step 2

Arrange squash and tomatoes decoratively, like rows of shingles (some may need to be cut in half), in the prepared dish.

Step 3

Combine shallot, 1/4 cup basil, oil, salt and pepper in a small bowl. Spoon the mixture over the vegetables. Sprinkle evenly with mozzarella. Bake until the vegetables are tender and the cheese has melted, about 30 minutes. Sprinkle with the remaining 2 tablespoons basil. Drizzle with balsamic vinegar, if desired.