Preheat oven to 400 degrees.
Cut spaghetti squash in half and scoop out seeds (details on how to do this safely on the Spaghetti Squash Noodles link below.)
Bake spaghetti squash for 45-50 minutes. Let cool for 20 minutes then shred into noodles.
While spaghetti squash is baking, juice lemon and put it in a bowl. Add scallops and marinate for 15 minutes. Drain and pat dry.
While squash is cooling, heat 1 tablespoon avocado oil in a large saute pan on high heat.
Add scallops and cook for 3 minutes. Flip and cook for an additional 1-2 minutes. Remove from the pan.
In the same pan, lower heat slightly and add another 1 tablespoon avocado oil. Add onion and mushrooms. Cook for 3 minutes, stirring occasionally.
Add zucchini, garlic, herbs and salt to the pan. Cook for 5-6 minutes, stirring occasionally.
Turn off heat and mix in scallops.
Serve each plate by putting spaghetti squash noodles on the bottom and topping with scallops, vegetables and herbs.
To finish, top with fresh juice from a lemon wedge and additional salt and oil to taste.