Step 1

Arrange a rack in the middle of the oven and heat to 375°F.

Step 2

Place the cherry tomatoes, 1 tablespoon of the olive oil, 1 tablespoon of the thyme, 1/4 teaspoon of salt, and a few grinds of black pepper in a large bowl and toss to combine. Transfer to one half of a rimmed baking sheet and arrange the tomatoes so that they are cut-side down.

Step 3

Place the mushrooms, garlic, remaining 2 tablespoons olive oil, remaining 1 tablespoon thyme, remaining 1/4 teaspoon salt, and a few grinds of black pepper in the same bowl and toss to combine. Transfer to the other half of the baking sheet and spread out in a single layer.

Step 4

Roast until the vegetables are soft and caramelized, 30 to 35 minutes. Remove from the oven and mash the tomatoes gently with a fork to realize some of their juices. Drizzle the balsamic vinegar over the vegetables and toss to combine and evenly coat the vegetables. Serve warm or at room temperature.