Preheat your oven to 375°F (190°C) and lightly grease a medium baking dish with butter or olive oil.

Steam or blanch the mixed winter vegetables for about 3-4 minutes until just tender. Drain well and pat dry.

In a large mixing bowl, combine the prepared vegetables with the cream of mushroom soup, milk, cheese, thyme, garlic powder, salt, and pepper. Stir until well-coated.

Spread the creamy vegetable mixture evenly into the prepared baking dish.

In a separate bowl, mix the breadcrumbs with melted butter. Sprinkle this mixture over the top of the casserole.

Place the baking dish in the preheated oven and bake uncovered for 25-30 minutes until golden-brown and bubbly.

Once baked, remove from the oven and let it rest for 5 minutes before serving.