Savory Baked Feta

Name: Savory Baked Feta
Ingredients: ½ red onion, sliced 1/4-in. thick; ½ green bell pepper, cored, seeded, and sliced into 1/4-in. rounds; ½ cup halved cherry tomatoes; 6 kalamata olives, pitted and halved; 2 teaspoons dried oregano, divided; 2 ½ teaspoons crushed red pepper, divided (optional); 3 or 4 fresh thyme sprigs, divided (optional); 5 tablespoons extra-virgin olive oil, divided, plus more for brushing; 1 8-oz. block feta cheese (preferably packed in brine); Fresh mint leaves, for garnish (optional); Crostini or pita chips, for serving