Preheat the oven to 425 F and line a large baking sheet with parchment paper.
Add the gnocchi, vegetables, and sausage to the baking sheet and top with avocado oil, and seasonings. Toss to coat.
Transfer to the oven and bake for 25-30 minutes, tossing halfway through. Bake until the internal temperature of the sausage is 165 F and the gnocchi is crisp.
Remove the sheet pan from the oven and add the spinach immediately. Toss to coat, allowing the spinach to lightly wilt.
To make the dressing, use a blender or immersion blender, and blend the olive oil, lemon, garlic, basil, parsley, salt, and pepper until smooth.
Top the baking sheet with the dressing and toss to coat. Serve fresh.