Remove the baking sheet and lightly brush each piece of zucchini with ketchup (or tomato sauce). I used to cook with ketchup for barbecue.
Sprinkle with cheese.
Place a thin circle of sausage on top and sprinkle with spices to taste: oregano, thyme, basil or a mixture of them. I have thyme and basil here.
Put the baking sheet back in the oven for another 5 minutes.