Rinse zucchini under cold water and peel
Cut off top and bottom edge of zucchini and put it through the spiralizer**
Then put your zucchini noodles in a colander and sprinkle with generous amount of salt
Let sit about 20-30 minutes. The goal is to remove as much moisture from the noodles as possible
Meanwhile in large skillet saute onions, garlic, mushrooms, salt, and pepper in butter and olive oil about 8-10 minutes
Rinse zucchini noodles and pat dry. Combine with onions, garlic, and mushrooms. Cook several more minutes.
Top with freshly grated parmesan cheese