Preheat your oven to 180°C / 350-375°F / Gas Mark 4-5
Line your baking tray with greaseproof paper
Use a knife and chopping board to cut the ends of the zucchini and slice them into thickish pieces
Add cherry tomatoes to a mixing bowl and use a skewer to pierce Note 3
Cut the onions in half, remove the skins and ends and cut again into chunky pieces
Add the zucchini and onions to the cherry tomatoes and stir to combine
Combine the olive oil, salt and pepper, dried thyme and dried onion, use a mini whisk to combine
Use a knife and chopping board to chop the mushrooms in half and half again
Pour ¾ of the seasoned oil over the mixed vegetables and stir to combine
Pour remaining oil over mushrooms and stir to combine
Transfer mixed vegetables to baking tray and spread evenly and in a flat layer
Use a skewer to pierce the sausages
Use a knife and chopping board the cut the sausages in half
Use tongs to place the cut sausages on top of the vegetables
Place the baking tray in the oven on a middle rack and bake for 15 mins
Use oven mits to remove the baking tray and use tongs to rotate the sausages
Scatter the mushrooms around the sausages and vegetables
Use oven mits to return the baking dish to the oven for 30 mins
Use oven mits to remove the baking tray and set on heatproof surface
Scatter fresh spinach leaves throughout to serve (optional)
Serve with gravy (optional)