Preheat your oven to 200°C (390°F) and line a baking sheet with parchment paper.
Chop your leftover vegetables into small, uniform pieces, about 1-2 cm, to ensure even cooking and mixing.
Place the chopped vegetables in a large mixing bowl and mash them slightly with a fork or potato masher to help break them down.
Add the breadcrumbs, beaten egg, cumin, coriander, and chopped herbs to the bowl. Mix everything together until well combined; the mixture should hold together when pressed.
Shape the mixture into small, flat cutlets about 2-3 inches in diameter, then place them gently on the prepared baking sheet, pressing slightly to flatten.
Lightly brush or spray the tops of the cutlets with olive oil for a crispy, golden crust.
Bake in the preheated oven for 20-25 minutes, flipping the cutlets halfway through, until they are golden brown and crispy around the edges.
Remove from the oven and let the cutlets rest on a wire rack for 5 minutes to help maintain their crispness.
Serve the baked vegetable cutlets warm, with a squeeze of lemon or your favorite dipping sauce for added flavor.