Preheat the oven. Set to 425°F (220°C).
Line a large baking sheet with parchment for easy cleanup.
Prep the vegetables. Slice the red onion into thin wedges, cut the pepper into strips, halve the cherry tomatoes, and slice the zucchini. For eggplant, cut into half-moons. Aim for similar thickness so everything roasts evenly.
Toss with oil and seasoning. On the baking sheet, combine vegetables with 2–3 tablespoons olive oil, minced garlic, 1 tablespoon za’atar, salt, and pepper.
Spread into a single layer.
Roast until caramelized. Bake for 20–25 minutes, stirring halfway. You want golden edges and tender centers. Tomatoes should slump and release juice; that’s flavor.
Warm the flatbreads. In the last 5 minutes, slide flatbreads onto the oven rack or a separate tray to warm and lightly crisp.
Assemble. Place warm flatbreads on a board.
Scatter roasted vegetables on top, then crumble feta generously. Add a small pinch of za’atar over the feta for aroma.
Finish with brightness. Zest the lemon over the flatbreads, then add a light squeeze of juice. Drizzle with a little olive oil.
Sprinkle herbs and, if you like, red pepper flakes or pomegranate seeds for color and tang.
Serve immediately. Cut into wedges and enjoy while warm.