Slice a whole zuc using the 2.5mm slicer on your Mandoline slicer.

In a small casserole dish, add a layer of zucchini slices. It doesn't have to look pretty and the slices can overlap, just make sure the bottom is covered.

Top the zucchini with about 1/4 cup of sauce and smear it around. make sure you have lots of sausage chunks. The zucchini noodles don't need to be perfectly covered - the sauce spread out as it cooks and moisture is released from zucchini.

Sprinkle 1/4 cup each of the mozzarella and Parmesan cheeses over the sauce.

Continue to layer in this way for 3 or 4 layers. I like to end with some zucchini strips topped with cheese (no sauce on the top).

Bake uncovered for 30 minutes.

Remove from oven and set cooling rack for 5 minutes before serving.