Line a 9x13 casserole dish with foil drizzle with a bit of oil. Coat pan and set aside.
Put the sausage rounds, onions and potatoes into a large bowl. Drizzle with two tablespoons of olive oil. Toss by hand or stir with spoon until well coated.
Season with 1/2 teaspoon paprika and 1/2 teaspoon dried thyme and cup of sharp cheddar cheese. Again toss or stir until well coated.
Pour mixture into prepared 9x13 casserole dish
Place into the heated oven and roast for 45 minutes to an hour stirring every 15 to 20 minutes until potatoes are tender and golden brown. Once the potatoes are cooked add another handful of cheese to the top and put in the oven until cheese is melted.