Preheat your oven to 400°F and line a baking sheet with parchment paper.
Carefully slice the spaghetti squash in half lengthwise, scoop out the seeds, and brush the flesh with one teaspoon of olive oil.
Place the squash cut-side down on the baking sheet and roast for 40 to 45 minutes until the skin is easily pierced with a fork.
While the squash roasts, season the chicken breast with garlic powder, sea salt, and black pepper.
Heat the remaining teaspoon of olive oil in a skillet over medium heat and cook the chicken until golden and cooked through, then shred it into bite-sized pieces.
In a small mixing bowl, stir together the Greek yogurt, grated parmesan cheese, and freshly chopped parsley.
Once the squash is done, use a fork to scrape the strands into a large bowl, then fold in the shredded chicken and the yogurt herb sauce until the mixture is creamy and well combined.