Step 1

Preheat an air fryer to 400 degrees F (200 degrees C) according to manufacturer's directions.

Step 2

Pour balsamic vinegar into a microwave-safe container. Cook on high power until vinegar is reduced by half, 2 1/2 to 3 minutes. Set aside.

Step 3

Combine asparagus, cherry tomatoes, olive oil, salt, and pepper in a large bowl and toss until well combined. Spread out vegetables in the air fryer basket in a single layer. You might need to cook in batches.

Step 4

Cook in the air fryer until asparagus is lightly browned and the tomatoes begin to burst, about 10 minutes.

Step 5

Place vegetables on a serving platter and drizzle with reduced balsamic vinegar. Sprinkle with feta cheese and serve warm.