Preheat oven to 350F.

Wash zucchini, cut ends off, and cut in half lengthwise. Put in a microwave-safe dish with a little water to steam and microwave for about 10 minutes or until soft.

Scrape out the seeded center of the zucchinis and put centers in a separate bowl.

Dice and saute half an onion and add to the bowl with the zucchini filling.

Brown sausage with thyme, crushed red pepper, and garlic and add to the filling.

Add parmesan cheese to the filling, reserving some for topping.

Place zucchinis on a cookie sheet and fill with the sausage filling. Sprinkle with reserved parmesan cheese.

Bake for 10 to 15 minutes or until cheese is melted and filling is hot.