Preheat your oven to 425°F and line a large sheet pan with parchment paper.
In a large bowl, toss chickpeas with 2 tablespoons olive oil, oregano, garlic powder, salt, and pepper until well coated.
In another bowl, toss bell peppers, onion, and cherry tomatoes with remaining 2 tablespoons olive oil and a pinch of salt.
Spread chickpeas and vegetables evenly on the prepared sheet pan, making sure not to overcrowd.
Roast for 25 minutes, stirring halfway through, until chickpeas are crispy and vegetables are tender and slightly charred.
Remove from oven, drizzle with lemon juice, and sprinkle with crumbled feta and fresh parsley before serving.