Preheat Oven: Set your oven to 400°F (200°C) to get it nice and hot for roasting.
Prep Veggies: Place sliced bell pepper, zucchini, red onion, cherry tomatoes, and mushrooms in a large bowl. Toss them with olive oil, minced garlic, salt, and pepper.
Roast Veggies: Spread the veggie mix evenly on a baking sheet. Roast in the oven for about 20 minutes or until they are tender and slightly caramelized.
Prep Flatbread: While the veggies are roasting, place your flatbread on another baking sheet.
Assemble Flatbread: Once the veggies are ready, remove them from the oven. Scatter the roasted veggies evenly over the flatbread. Sprinkle mozzarella cheese and crumbled feta on top.
Bake Flatbread: Put the assembled flatbread back in the oven for 10-12 minutes until the cheese is hot and bubbly.
Add Finishing Touches: Take the flatbread out of the oven. Sprinkle dried oregano over the top and add fresh basil leaves. Drizzle with balsamic glaze for that extra special touch.
Serve: Slice into pieces and enjoy while it's hot!