Line a large baking sheet with parchment paper. On one half of the baking sheet, place the spaghetti squash flesh-side down. On the other half, evenly spread out the chicken. Cook for about 30 to 35 minutes, or until the squash is fork-tender and the chicken is cooked through.
When cool enough to handle, use a fork to shred the squash into noodles. Gently mix in the pesto.
Chop the chicken and place overtop the spaghetti squash. Garnish with basil and sea salt, if needed. Enjoy!