In a bowl, toss the drained chickpeas with olive oil, salt, pepper, thyme, garlic powder, and dill until well coated.
Spread the seasoned chickpeas on a baking sheet in a single layer. Bake for 18-20 minutes, stirring halfway through, until crispy.
While the chickpeas bake, prepare the vegetables: slice the cucumber, dice the tomatoes, thinly slice the red onion, and shred the lettuce.
Warm the pita breads in the oven for the last 5 minutes of baking or in a toaster.
To assemble, open each pita pocket and fill with baked chickpeas, cucumber, tomatoes, red onion, and lettuce. Drizzle with a little olive oil and lemon juice for extra flavor. Serve immediately.